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Scholarly Interest Report
         
Randall G. Hulet
Professor
Fayez Sarofim Professor of Physics
 
e-mail:randy@rice.edu
 
  • B.S. Physics (1978) Stanford University
  • Ph.D. Physics (1984) M.I.T.
 
Primary Department
   Department of Physics and Astronomy
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Department Affiliations
 
  • Department of Physics and Astronomy
  •  
    Websites
     Atomcool
     Atomcool
     Rice Laboratory for Ultracold Physics
     
    Research Areas
     Experimental atomic physics with ultracold atoms; Bose-Einstein condensation; Fermi superfluidity; Simulation of condensed matter with ultracold atoms confined to optical lattices.
     

    Research Statement

     

    Randall Hulet investigates atoms at temperatures as low as a few nano-Kelvin. At these low temperatures the quantum mechanical wavelengths of the atoms can be as large as 1 micron, greatly altering normal atomic behavior. Hulet and his group have used laser cooling and atom trapping techniques to explore this exotic regime of matter, investigating ultracold atom collisions and quantum statistical effects, such as Bose-Einstein condensation. Collisions between ultracold atoms can reveal the subtle nature of their mutual interaction. Hulet and group use laser spectroscopy to probe these interactions. By this technique they discovered that two 7Li atoms weakly attract each other at very low temperature. Theorists believed that this fact would prevent lithium from undergoing a Bose-Einstein condensation, the paradigm of all quantum statistical phase transitions. In 1995, however, Hulet and his group succeeded in coaxing a gas of magnetically confined 7Li atoms to Bose condense. Subsequent investigation of this novel system has lead to the direct observation of condensate growth and collapse.


    Hulet and group later produced the first quantum degenerate Bose/Fermi (7Li / 6Li) mixture of ultracold gases. The size of the fermion atom cloud was stabilized by Fermi pressure, in analogy to a white dwarf or neutron star. More recent investigations have focused on superfluidity of atomic Fermi gases, using Cooper paired 6Li atoms. These pairs are a close analogy to those resulting in superconductivity of some solids. This goal of this work is to better understand the nature of high-temperature superconductors and other strongly correlated materials.


     

     

    Research Statement - Randall Hulet

     

    The focus of my research program is the study of quantum gases of ultracold atoms. My current activities employ the isotopes of lithium, the fermion 6Li and the boson 7Li, to model complex condensed matter phenomena and materials. Ultracold atomic gases are highly controllable and well-characterized making them ideal systems to test fundamental models of important materials, such as high-temperature superconductors.


    In one experiment, Bose-Einstein condensates are used to explore the effect of random disorder on superfluidity, while in another, the fermion counterparts are used to investigate fermionic superfluidity in the strongly-interacting regime. Materials, no matter how pure they may be or how carefully they are prepared, inevitably have some random disorder. This disorder can be caused by crystal defects, impurities, or anything that changes the landscape of how electrons move about in the material. Many years ago, P.W. Anderson suggested that with enough disorder, an electrical conductor can be transformed to an insulator due to localization of the electrons. Disorder can also induce an otherwise superconducting material to become insulating, with implications for important classes of superconductors, such as those made of thin films or small grains. Many of the predicted effects in superconductors, such as those having to do with disorder, are difficult to observe and to quantify because of the complexity of actual materials. Scientists have recently turned to more idealized “stand-in” systems, comprised of gases of ultra-cold atoms, to model real materials. When the atoms are cooled to temperatures below 1 millionth of a degree above absolute zero, they form a Bose-Einstein condensate, which is a superfluid. A superfluid flows without impedance, in analogy to the electrons in a superconductor that flow without electrical resistance. But unlike real materials, the ultra-cold atom stand-ins are so extremely pure and controllable that they can be used as idealized realizations of theoretical models. Disorder can be imposed on a Bose-Einstein condensate by using optical speckle. Speckle is produced by passing a laser beam through a diffusive piece of glass, such as one that has been sand blasted. The variation of the light amplitude across the condensate causes the atoms to experience a random potential, much like the effect of impurities on the electrons in a superconductor. We have used optical speckle to explore the disorder-induced transition from a superfluid to an insulator in a Bose-Einstein condensate of lithium atoms. The strength of the disorder was varied by adjusting the intensity of the laser beam. They found that the flow of the condensate was impeded when the energy scale of the disorder was comparable to the interaction energy of the condensate. Furthermore, by taking images of the atoms while still confined, the Rice group found that only small ripples in the condensate density appear at the onset of localization. It takes much greater disorder strength to completely fragment the condensate into small disconnected pieces. These observations have provided new insight into the nature of the disorder-induced transition that may have implications for the superconductor-insulator transition. In the future, the Rice group plans to reduce the interaction energy of the condensate in an attempt to view the elusive single-particle effect known as Anderson localization.


    The pairing of fermions to form composite bosons underlies two of the most remarkable phenomena in physics: superconductivity and superfluidity. Below a certain critical temperature the electrons in a superconductor pair up, one with its spin up and the other with its spin down, forming the supercurrent-carrying Cooper. Although the conventional BCS theory of superconductivity requires an equal number of spin-up and spin-down particles, physicists have long speculated on what happens if this condition is not met. At Rice, we have shown that a mixture of lithium-6 atoms, the fermions, can pair up even when there are unequal numbers of spin-up and spin-down atoms. With equal numbers and at low enough temperature, about 30 nK, the lithium-6 atoms phase separate into a superfluid core surrounded by a normal shell of the majority spin-up atoms. The interface between the superfluid and normal phases is sharp, indicative of a first order phase boundary, and surface tension at this boundary causes a deformation of the superfluid. The confinement potential creates an elongated cigar-like distribution that we observe to become progressively less elongated with increasing number mismatch, as the superfluid is driven to minimize the ratio of the surface area to volume. Phase separation was just one of the scenarios predicted by theorists prior to our experiment. More exotic phases, including one with pairs having non-zero center of mass momentum, have also been predicted. Our current efforts are focused on finding this so-called FFLO phase (after its originators), especially in one dimension where this new phase of matter is predicted to be especially robust. Research with strongly interacting Fermi gases bear on diverse phenomena ranging from high-temperature superconductivity to the dense quark matter predicted to reside in the cores of neutron stars.

     
    Teaching Areas
     Quantum Mechanics; Modern Atomic Physics
     
    Selected Publications
     Refereed articles
     

    J. Cuevas, P. G. Kevrekidis, B. A. Malomed, P. Dyke, and R. G. Hulet "Interactions of solitons with a Gaussian barrier: Splitting and recombination in quasi-1D and 3D." New Journal of Physics, 15: 063006.

     
     

    P. Dyke, S. E. Pollack, and R. G. Hulet, “Finite range corrections near a Feshbach resonance and their role in the Efimov effect”, Physical Review A 88, 023625 (2013).

     
     

    C. J. M. Mathy, D. A. Huse, and R. G. Hulet, “Enlarging and cooling the Néel state in an optical lattice”, Physical Review A 86 023606 (2012).

     
     

    P. M. Duarte, R. A. Hart, J. M. Hitchcock, T. A. Corcovilos, T.-L. Yang, A. Reed, and R. G. Hulet "All-Optical Production of a Lithium Quantum Gas Using Narrow-Line Laser Cooling." Physical Review A, 84 (2011) : 061406.

     
     

    Y. A. Liao, M. Revelle, T. Paprotta, A. S. C. Rittner, Wenhui Li, G. B. Partridge, and R. G. Hulet "Metastability in Spin-Polarized Fermi Gases." Physical Review Letters, 107 (2011) : 145305.

     
     

    D. Dries, S. E. Pollack, J. M. Hitchcock, and R. G. Hulet "Dissipative Transport of a Bose-Einstein Condensate." Physical Review A, 82 (2010) : 033603.

     
     

    S. E. Pollack, D. Dries, R. G. Hulet, K. M. F. Magalhães, E. A. L. Henn, E. R. F. Ramos, M. A. Caracanhas, and V. S. Bagnato "Collective excitation of a Bose-Einstein condensate by modulation of the atomic scattering length." Physical Review A, 81 (2010) : 053627.

     
     

    Yean-an Liao, Ann Sophie C. Rittner, Tobias Paprotta, Wenhui Li, Guthrie B. Partridge, Randall G. Hulet, Stefan Baur, and Erich J. Mueller "Spin-Imbalance in a One-Dimensional Fermi Gas." Nature, 467 (2010) : 567.

     
     

    S. E. Pollack, D. Dries, M. Junker, Y. P. Chen, T. A. Corcovilos, and R. G. Hulet "Extreme tunability of interactions in a 7Li Bose-Einstein condensate." Physical Review Letters, 102 (2009) : 090402.

     
     

    S. E. Pollack, D. Dries, and R. G. Hulet "Universality in Three- and Four-Body Bound States of Ultracold Atoms." Science, 326 (2009) : 1683-6.

     
     

    T. A. Corcovilos, S. K. Baur, J. M. Hitchcock, E. J. Mueller, and R. G. Hulet "Detecting antiferromagnetism of atoms in an optical lattice via optical Bragg scattering." Physical Review A, 81 (2010) : 013415.

     
     

    Wenhui Li, G. B. Partridge, Y. A. Liao and R. G. Hulet "Polarized Atomic Fermi Gases." International Journal of Modern Physics B, 23 (2009) : 3195-3204.

     
     

    Yean-an Liao, Ann Sophie C. Rittner, Tobias Paprotta, Wenhui Li, Guthrie B. Partridge, Randall G. Hulet, Stefan Baur, and Erich J. Mueller "Spin-Imbalance in a One-Dimensional Fermi Gas." Nature (2010) Submitted

     
     

    Yong P. Chen, J. Hitchcock, D. Dries, M. Junker, C. Welford, S. E. Pollack, T. A. Corcovilos, and R. G. Hulet "Experimental Studies of Bose-Einstein Condensates in Disorder." Physica D, 238 (2009) : 1321.

     
     

    M. Junker, D. Dries, C. Welford, J. Hitchcock, Y. P. Chen, and R. G. Hulet "Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance." Physical Review Letters, 101 (2008) : 060406.

     
     

    Yong P. Chen, J. Hitchcock, D. Dries, M. Junker, C. Welford, and R. G. Hulet "Phase coherence and superfluid-insulator transition in a disordered Bose-Einstein condensate." Physical Review A, 77 (2008) : 033632.

     
     

    Hiroki Saito, Randall G. Hulet, and Masahito Ueda "Stabilization of a Bose-Einstein droplet by hyperfine Rabi oscillations." Physical Review A, 76 (2007) : 053619.

     
     

    G. B. Partridge, W. Li, R. I. Kamar, Y. A. Liao and R. G. Hulet, "Pairing and Phase Separation in a Polarized Fermi Gas." Science, 311 (2006) : 503.

     
     

    G. B. Partridge, Wenhui Li, Y. A. Liao, and R. G. Hulet, "Pairing, Phase Separation and Deformation in the BEC-BCS Crossover." Journal of Low Temperature Physics, 148 (2007) : 323-330.

     
     

    G. B. Partridge, Wenhui Li, Yean-an Liao, Randall G. Hulet, Masudul Haque, and H. T. C. Stoof, "Deformation of a Trapped Fermi Gas with Unequal Spin Populations." Physical Review Letters, 97 (2006) : 190407.

     
     

    Wenhui Li, G. B. Partridge, Y. A. Liao and R. G. Hulet, "Pairing of a trapped Fermi gas with unequal spin populations." Nuclear Physics A, 790 (2007) : 88c-95c.

     
     Book chapters
     

    K. Levin and Randall G. Hulet, “The Fermi Gases and Superfluids:  Short Review of Experiment and Theory for Condensed Matter Physicists”, chapter in Contemporary Concepts of Condensed Matter Science, P. B. Allen, E. Burstein, D. L. Mills, P.J. Stiles, series eds; K. Levin, A. L. Fetter, and D. M. Stamper-Kurn, vol. eds, pgs. 69-94 (Elsevier, Oxford, 2012).

     
     Refereed conference papers
     

    R.G. Hulet "Photoassociation of Ultracold Atoms." Proceedings of the Dalgarno Celebratory Symposium (2010)

     
     

    R. G. Hulet, D. Dries, M. Junker, S. E. Pollack, J. Hitchcock, Y. P. Chen, T. Corcovilos, and C. Welford "Tunable Interactions in a Bose-Einstein Condensate of Lithium: Photoassociation and Disorder-Induced Localization." Proceedings of the XXI International Conference on Atomic Physics (2009) : 150-159.

     
     

    R. G. Hulet "Photoassociation of Ultracold Atoms." Proceedings of the Alex Dalgarno Celebratory Symposium (2009) In Press

     
     

    R. G. Hulet, D. Dries, M. Junker, S. E. Pollack, J. Hitchcock, Y. P. Chen, T. Corcovilos, and C. Welford "Tunable Interactions in a Bose-Einstein Condensate of Lithium: Photoassociation and Disorder-Induced Localization." Pushing the Frontiers of Atomic Physics: Proceedings of the XXI International Conference on Atomic Physics (2009) In Press

     
     

    Randall G. Hulet, Guthrie B. Partridge, Wenhui Li, and Y. A. Liao "Fermion Pairing with Unequal Spin Populations." Coherence and Quantum Optics IX (2008) : 110-115.

     
    Presentations
     Conference Committee Member
     

    Chair of Local Organizing Committee.  "A." American Physical Society Annual DAMOP Meeting, Houston, TX. (5/27/10)

     
     Invited Talks
     

    Co-Author.  "Experimental Investigation of the 3D Fermi-Hubbard Model." DARPA Optical Lattice Emulator Workshop, Chicago. (5/31/12) With Pedro Duarte

     
     

    Colloquium Speaker.  "Fermions in Optical Lattices." North Carolina State University, Raleigh, NC. (10/1/12)

     
     

    Invited Speaker.  "Fermions in Optical Lattices." DARPA Workshop on Strongly Correlated Materials, Arlington, VA. (11/8/12)

     
     

    Invited Speaker.  "Fermions in Optical Lattices." International Conference on Frontiers of Cold Atoms, Hong Kong. (5/17/12)

     
     

    Invited Speaker.  "Fermions in Optical Lattices." Latin American Optics and Photonics Conference, San Sebastiao, Brazil. (11/12/12)

     
     

    Invited Speaker.  "Fermions in Optical Lattices." Quo Vadis BEC?, Bad Honnef, Germany. (8/22/12)

     
     

    Seminar Speaker.  "Fermions in Optical Lattices." Harvard University, (10/17/12)

     
     

    Invited Speaker.  "Fermions in Optical Lattices." Gordon Conference on Correlated Electron Systems, Mt Holyoke College, MA. (6/26/12)

     
     

    Plenary Speaker.  "Quantum Simulation with Atoms in Optical Lattices." Physics of Quantum Electronics, Snowbird, UT. (1/7/13)

     
     

    Invited Speaker.  "Spin-Imbalance in One and Three-Dimensional Fermi Gases." APS March Meeting, Boston. (2/28/12)

     
     

    Plenary Speaker.  "Three and Four-Body Efimov States in an Ultracold Atomic Gas." Physics of Quantum Electronics, Snowbird, UT. (1/5/12)

     
     

    Colloquium Speaker.  "Tuning In to Ultracold Atoms." Columbia University, New York. (4/2/12)

     
     

    Colloquium Speaker.  "Ultracold Atoms in Optical Lattices." University of Chicago, Chicago, IL. (11/29/12)

     
     

    Invited speaker.  "“Optical Lattice Simulations of Correlated Fermions”." DARPA Optical Lattice Emulator Program Workshop, Vail, CO. (6/22/11)

     
     

    Invited speaker.  "“Optical Lattice Simulations of Correlated Fermions”." DARPA Optical Lattice Emulator Program Workshop, Ft. Lauderdale, FL . (12/7/11)

     
     

    Invited speaker.  "“Pairing in Polarized Fermi Gases." Aspen Workshop on Cold Quantum Gases near Resonances, Aspen, CO. (6/7/11)

     
     

    Invited speaker.  "“Pairing in Polarized Fermi Gases”." International Conference on Laser Spectroscopy (ICOLS), Hameln, Germany. (6/1/11)

     
     

    Invited speaker.  "“Pairing in Polarized Fermi Gases”." Atomic Physics Gordon Conference, Mt. Snow, VT. (6/26/11)

     
     

    Invited speaker.  "“Pairing in Unusual Places – Stretching the Realm of Superconductivity”." NewSpin2 Conference, Texas A&M University. (12/15/11)

     
     

    Invited speaker.  "“Pairing in Unusual Places – Stretching the Realm of Superconductivity”." Physics Colloquium, Ohio State University. (3/30/11)

     
     

    Invited speaker.  "“Pairing in Unusual Places – Stretching the Realm of Superconductivity”." Physics Colloquium, University of Colorado, Boulder. (11/9/11)

     
     

    Invited speaker.  "“Pairing in Unusual Places – Stretching the Realm of Superconductivity”." Summer School Lecture, University of São Paulo, São Carlos, Brazil. (4/4/11)

     
     

    Invited speaker.  "“Propagation of Bose Condensates and Matter-Wave Solitons Across Disordered or Barrier Potentials”." Physics of Quantum Electronics Conference, Snowbird, UT. (1/5/11)

     
     

    Invited speaker.  "“Propagation of Bose Condensates and Matter-Wave Solitons Across Disordered or Barrier Potentials”." International Center for Theoretical Physics Conference on Research Frontiers in Ultra-Cold Atomic and Molecular Gases, Goa, India. (1/11/11)

     
     

    Invited speaker.  "“Spin-Polarized Fermions in 1D”." Institute for Nuclear Theory Workshop, University of Washington, Seattle. (5/16/11)

     
     

    Invited speaker.  "“Three and Four-Body Efimov States in an Ultracold Atomic Gas”." International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC), Belfast, Northern Ireland. (8/2/11)

     
     

    Invited speaker.  "“Three and Four-Body Efimov States in an Ultracold Atomic Gas”." Workshop on Coherence and Decoherence at Ultracold Temperatures, Technical University Munich. (9/8/11)

     
     

    Invited speaker.  "“Tunable Interactions in Bose-Einstein Condensates - The Efimov Effect”." Princeton Condensed Matter Summer School, Princeton, NJ. (8/10/11)

     
     

    Invited speaker.  "“Tunable Interactions in Bose-Einstein Condensates - The Efimov Effect”." Summer School Lecture, University of São Paulo, São Carlos, Brazil. (4/4/11)

     
     

    Invited speaker.  "“Ultracold Atomic Fermions in Many-Body Systems”." NewSpin2 Conference Winter School, Texas A&M University. (12/12/11)

     
     

    Invited speaker.  "“Universality in Three and Four-Body Efimov States”." April Meeting of the APS, Anaheim, CA. (5/2/11)

     
     

    Invited speaker.  "Few Body Physics with Ultracold Atoms – The Efimov Family Tree." Physics Colloquium, University of New Mexico, Albuquerque. (10/7/11)

     
     

    Invited speaker.  "Few Body Physics with Ultracold Atoms – The Efimov Family Tree." Seminar, Ohio State University. (3/30/11)

     
     

    Invited speaker.  "Princeton Condensed Matter Summer School." Princeton Condensed Matter Summer School, Princeton, NJ. (8/11/11)

     
     

    Invited speaker.  "Dissipation of Superfluid Transport by Disorder and Quantum Tunneling of a Matter-Wave Soliton." Quo Vadis BEC?, Dresden, Germany. (8/19/10)

     
     

    Invited speaker.  "Few Body Physics with Ultracold Atoms – The Efimov Family Tree." Institute for Nuclear Theory, Seminar, University of Washington, Seattle. (4/26/10)

     
     

    Invited speaker.  "Optical Lattice Simulations of Correlated Fermions." DARPA Optical Lattice Emulator Workshop, Houston, TX. (5/24/10)

     
     

    Invited speaker.  "Optical Lattice Simulations of Correlated Fermions." DARPA Optical Lattice Emulator Workshop, Hollywood, FL. (12/7/10)

     
     

    Invited speaker.  "Pairing in Polarized Fermi Gases." Center for Ultracold Atoms, Seminar, MIT, Cambridge, MA. (11/9/10)

     
     

    Invited speaker.  "Pairing in Unusual Places – Stretching the Realm of Superconductivity." Departmental Colloquium, Heidelberg, Germany. (4/16/10)

     
     

    Invited speaker.  "Spin-Imbalance in a One-Dimensional Fermi Gas." Kavli Institute for Theoretical Physics, UCSB, Santa Barbara. (10/11/10)

     
     

    Invited speaker.  "Spin-Imbalance in a One-Dimensional Fermi Gas." American Physical Society March Meeting, Portland, OR. (3/18/10)

     
     

    Invited speaker.  "Spin-Imbalanced 1D Fermi Gas." New Spin Workshop, University of Utrecht, The Netherlands. (1/8/10)

     
     

    Invited speaker.  "Spin-Polarization of a One-Dimensional Fermi Gas." Strongly Correlated Electron Systems Meeting, Santa Fe, NM. (6/29/10)

     
     

    Invited speaker.  "Superfluid Dissipation and a Beam Splitter for Matter-Wave Solitons." Center for Nonlinar Studies Workshop, Santa Fe, NM. (6/23/10)

     
     

    Invited speaker.  "Superfluid Dissipation and a Beam Splitter for Matter-Wave Solitons." Nonlinear Quantum Gas Meeting, Ourense, Spain. (4/14/10)

     
     

    Invited speaker.  "Widely Tunable Interactions in a Bose Gas:  From Anderson Localization to Beyond Mean Field." Departmental Colloquium, Texas A&M University. (2/4/10)

     
     Keynote Speaker
     

    Plenary Speaker.  "“Pairing in Unusual Places – Stretching the Realm of Superconductivity”." Annual Meeting of the Deutsche Physikalische Gesellschaft (DPG), Dresden, Germany. (3/14/11)

     
    Supervised Theses & Dissertations
     Daniel Franklin Dries, Ph.D. Transport Properties of a Bose-Einstein Condensate in a Disordered or Single Defect Potential. (2010) (Thesis or Dissertation Director)

     Daniel Dries, Ph.D. Disorder Induced Damping and Localization of a Bose-Einstein Condensate. (2010) (Thesis or Dissertation Director)

     Yean-an Liao, Ph.D. Strongly Interacting Fermi Gases in One and Three Dimensions. (2010) (Thesis or Dissertation Director)

     Yean-an Liao, Ph.D. Stongly Interacting Fermi Gases in 3D and 1D. (2011) (Thesis or Dissertation Director)

     James Michael Hitchcock, Ph.D. Antiferromagnetism of Ultracold Atoms in an Optical Lattice. (2011) (Thesis or Dissertation Director)

     Tobias Paprotta, Ph.D. FFLO State in a One-Dimensional Fermi Gas. (2012) (Thesis or Dissertation Director)

     Pedro Duarte Gelvez, Ph.D. d-Wave Superfluidity in an Optical Lattice. (2012) (Thesis or Dissertation Director)

     Melissa Revelle, M.S. Dimensional Crossover in a Polarized Fermi Gas. (2012) (Thesis or Dissertation Director)

     Pedro Duarte Gelvez, Ph.D. Quantum Magnetism in an Optical Lattice. (2013) (Thesis or Dissertation Director)

     Sidong Lei, MS Bright Matter-Wave Solitons. (2013) (Thesis or Dissertation Director)

     Tsung-Lin Yang, MS d-Wave Superfluidity in an Optical Lattice. (2014) (Thesis or Dissertation Director)

     David Tam, MS Spin-Orbit Coupled Bose-Einstein Condensates. (2014) (Thesis or Dissertation Director)

     Pedro Duarte Galvez, Ph.D. Quantum Magnetism in an Optical Lattice. (2014) (Thesis or Dissertation Director)

     Melissa Revelle, Phd Dimensional Crossover of a Spin-Polarized Fermi Gas. (2015) (Thesis or Dissertation Director)

     Tobias Paprotta, Ph.D. FFLO State in a One-Dimensional Fermi Gas. (Thesis or Dissertation Director)

     Evan J. Olson, M.S. The Interaction of a Matter Wave Soliton with a Potential Barrier. (Thesis or Dissertation Director)

     James Hitchcock, Ph.D. Antiferromagnetism of Ultracold Atoms in an Optical Lattice. (Thesis or Dissertation Director)

    Awards, Prizes, & Fellowships
     Willis E. Lamb Award for Laser Science and Quantum Optics, Physics of Quantum Electronics Conference (1/5/11)

     Outstanding Referee for Physical Review and Physical Review Letters, American Physical Society (3/10)

     Whitfield Lecturer, Penn State University (2007)

     NASA Exceptional Scientific Achievement Medal, NASA (2004)

     Fellow, American Physical Society (1996)

     I. I. Rabi Prize, American Physical Society (1995)

     Fellow, American Association for the Advancement of Science (1997)

     Research Fellow, Alfred P. Sloan Foundation (1988)

     Member, American Academy of Arts and Sciences (2003)

     Rosenthal Lecture, Yale University (1995)

     Honorary Doctorate, Utrecht University (2002)

     Presidential Young Investigators Award, National Science Foundation (1989)