Research Interests:

--Violations of discrete symmetries:
Search for time-reversal and CP-violation, as manifested by an electron electric dipole moment or a nuclear Schiff moment, using the amplification of these effects present in polar molecules (ThO, TlF, PbO, etc.). Measurement of neutral weak interaction couplings, using enhanced effects in diatomic free radicals (BaF). Theoretical calculations of symmetry violating effects in atoms and molecules. Search for small time variations in fundamental constants, using molecules and optically-excited nuclei. Search for small violations of the spin-statistics connection for photons, using atomic two-photon transitions. Measurement of parity-violating nuclear anapole moments, using both optical techniques (in atomic Yb) and radiofrequency methods (in atomic Fr and Dy, and in diatomic molecules).  Associated spectroscopic measurements in atoms and molecules.

--Ultracold polar molecules:
Development of methods for producing and trapping ultracold gases of polar molecules, including both direct laser cooling and trapping, and assembly from ultracold atoms. Symmetry-violation tests using ultracold molecules. Development of architectures for quantum computation based on polar diatomic molecules as qubits.  Spectroscopy of diatomic molecules.

Education

• Ph.D., Physics, University of California, Berkeley, 1994
• M.S., Physics, University of California, Berkeley 1989
• A.B., Physics, University of Chicago, 1985

Professional Experience

• 2020-             Joint Appointment, Argonne National Laboratory
• 2020-             Professor of Physics, University of Chicago and James Franck Institute
• 2004-2020     Professor of Physics, Yale University
• 2002-2004     Associate Professor of Physics, Yale University
• 1998-2002     Assistant Professor of Physics, Yale University
• 1997-98         Assistant Professor of Physics, Amherst College
• 1993-97         Postdoctoral Researcher, Lawrence Berkeley National Laboratory
• 1987-93         Graduate Student Research Assistant, Univ. of California, Berkeley
• 1985-86         Research Assistant, DESY and CERN

Honors and Awards

• Francis M. Pipkin Award, American Physical Society, 2006
• Fellow of the American Physical Society, 2005
• David and Lucile Packard Foundation Fellowship, 1999-2004
• Yale University Condé Award for Teaching Excellence, 2004
• Alfred P. Sloan Foundation Fellowship, 2000-2002
• Research Corporation Cottrell Scholars Award, 2000
• Research Corporation Research Innovation Award, 1998
• Research Corporation Cottrell College Science Award, 1997

Research Interests:

--Violations of discrete symmetries:
Search for time-reversal and CP-violation, as manifested by an electron electric dipole moment or a nuclear Schiff moment, using the amplification of these effects present in polar molecules (ThO, TlF, PbO, etc.). Measurement of neutral weak interaction couplings, using enhanced effects in diatomic free radicals (BaF). Theoretical calculations of symmetry violating effects in atoms and molecules. Search for small time variations in fundamental constants, using molecules and optically-excited nuclei. Search for small violations of the spin-statistics connection for photons, using atomic two-photon transitions. Measurement of parity-violating nuclear anapole moments, using both optical techniques (in atomic Yb) and radiofrequency methods (in atomic Fr and Dy, and in diatomic molecules).  Associated spectroscopic measurements in atoms and molecules.

--Ultracold polar molecules:
Development of methods for producing and trapping ultracold gases of polar molecules, including both direct laser cooling and trapping, and assembly from ultracold atoms. Symmetry-violation tests using ultracold molecules. Development of architectures for quantum computation based on polar diatomic molecules as qubits.  Spectroscopy of diatomic molecules.