Quantum phases of ultracold atomic gases
Ultracold atomic gases exhibit a fascinating insulatorsuperfluid quantum phase
transition in the presence of an applied optical lattice potential, as reviewed
in this article by Barbara Levi, Physics Today, 55,
April 2002, page 18. Paper 1 predicts new phases and quantum critical points
which can be induced simply by applying a strong potential gradient to a Mott insulator
created in this manner. Paper 2 investigates a variety of nonequilibrium processes
that can be studied in the vicinity of the superfluidinsulator transition.
PAPERS

Mott insulators in strong electric fields, S. Sachdev, K. Sengupta,
and S.M. Girvin, Physical Review B 66, 075128 (2002); condmat/0205169.

Nonequilibrium GrossPitaevskii dynamics of boson lattice models, A. Polkovnikov, S. Sachdev,
and S.M. Girvin, Physical Review A 66, 053607 (2002);
condmat/0206490.
 Scratching the Bose surface, S. Sachdev, Nature 418, 739 (2002); condmat/0208326.

Competing densitywave orders in a onedimensional hardboson model, P. Fendley, K. Sengupta, and S. Sachdev, Physical Review B 69, 075106 (2004); condmat/0309438.
 Quench dynamics across quantum critical points, K. Sengupta, S. Powell, and S. Sachdev, Physical Review A 69, 053616 (2004); condmat/0311355.
 Quantum phase transition in an atomic Bose gas with a Feshbach resonance, M. W. J. Romans, R. A. Duine, S. Sachdev, and H. T. C. Stoof, Physical Review Letters 93, 020405 (2004); condmat/0312446.

Depletion of the BoseEinstein condensate in BoseFermi mixtures, S. Powell, S. Sachdev, and H. P. Büchler, Physical Review B 72, 024534 (2005); condmat/0502299.
 Quantum criticality of a Fermi gas with a spherical dispersion minimum, K. Yang and S. Sachdev, Physical Review Letters 96, 187001 (2006);
condmat/0511641.
 Fermi surfaces and Luttinger's theorem in paired fermion systems, S. Sachdev and K. Yang, Physical Review B 73, 174504 (2006);
condmat/0602032.
 Excited state spectra at the superfluidinsulator
transition out of paired condensates, S. Powell and S. Sachdev, Physical Review A
75, 031601 (2007);
condmat/0608611.
 Renormalization group fixed points, universal phase diagram,
and 1/N expansion for quantum liquids with interactions near the
unitarity limit,
P. Nikolic and S. Sachdev, Physical Review A 75, 033608 (2007); condmat/0609106.
 Spin dynamics across the superfluidinsulator transition of spinful
bosons, S. Powell and S. Sachdev, Physical Review A 76, 033612 (2007); condmat/0703011.
 Superfluidinsulator transitions of the Fermi gas with nearunitary interactions
in a periodic potential, E. G. Moon, P. Nikolic, and S. Sachdev, Physical Review Letters 99, 230403 (2007); arXiv:0707.2383.
 Radio frequency spectroscopy of a strongly imbalanced Feshbachresonant Fermi gas,
M. Veillette, E. G. Moon, A. Lamacraft, L. Radzihovsky, S. Sachdev, and D.E. Sheehy, Physical Review A
78, 033614 (2008);
arXiv:0803.2517.
 Dilute Fermi and Bose Gases, S. Sachdev,
adapted from Chapter 16 of Quantum Phase Transitions, Second Edition, by S. Sachdev, Cambridge University Press (forthcoming);
contribution to Lecture Notes in Physics, "BCSBEC crossover and the Unitary Fermi Gas" edited by W. Zwerger; arXiv:1105.1793.
 Correlated phases of bosons in tilted, frustrated lattices,
S. Pielawa, T. Kitagawa, E. Berg, and S. Sachdev, Physical Review B 83, 205135 (2011);
arXiv:1101.2897
 Dicke quantum spin glass of atoms and photons,
P. Strack and S. Sachdev, Physical Review Letters 107, 277202 (2011);
arXiv:1109.2119
 Frustrated quantum Ising spins simulated by spinless bosons in a tilted lattice: from a quantum liquid to antiferromagnetic order,
S. Pielawa, E. Berg, and S. Sachdev, Physical Review B 86, 184435 (2012);
arXiv:1203.6653
 Spectral functions of the Higgs mode near twodimensional quantum critical points,
D. Podolsky and S. Sachdev, D. Podolsky and S. Sachdev, Physical Review B 86, 054508 (2012);
arXiv:1205.2700
 Quantum charge glasses of itinerant fermions with cavitymediated longrange interactions,
M. Müller, P. Strack and S. Sachdev, Physical Review A 86, 023604 (2012);
arXiv:1205.4027
 Mobile impurity near the superfluidMott insulator quantum critical point in two dimensions,
M. Punk and S. Sachdev, Physical Review A 87, 033618 (2013);
arXiv:1212.1161
 Keldysh approach for nonequilibrium phase transitions in quantum optics: beyond the Dicke model in optical cavities,
E. G. Dalla Torre, S. Diehl, M. D. Lukin, S. Sachdev, and P. Strack, Physical Review A 87, 023831 (2013);
arXiv:1210.3623
 Dicke Quantum Spin and Photon Glass in Optical Cavities: Nonequilibrium theory and experimental signatures,
M. Buchhold, P. Strack, S. Sachdev, and S. Diehl, Physical Review A 87, 063622 (2013);
arXiv:1304.5196
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