Group Meetings Schedule 2012

Sep 3rd, Xiaopeng Li,

Orbital Physics in one dimension

Sep 10th, Zhifang Xu,

Spinor BEC with spin-orbital couplings

Sep 17th, Bo Liu,

Anisotropic Topological Superfluid Phase of a 3D Dipolar Fermi Gas

Sep 24th, Jin-Long Yu

Quantum Dynamics of quenched lattice systems

Oct 10th, Xiaopeng Li

Superconductivity with repulsion in one dimension

Oct 31st (Wed 5pm Santa Barbara time), Zhifang Xu

Low energy excitations of Bose gases with spin-orbit coupling

Nov 15 (Thursay 9:30 am Beijing Time), Bo Liu,

Itinerant Ferromagnetism in Spin-Orbit Coupled Fermi Gases

Nov 20 (Tuesday 9:30 am Beijing Time), Jin-Long Yu,

Interaction effects in Kitaev's 1D chain

Dec 4, W. Vincent Liu, (in the super joint group meeting)

low dimensional spin imbalanced Fermi gases in strong coupling limit

Dec 11, Xiaopeng Li

Quench Dynamics as a probe of ``hidden" angular momentum ordering

Summer 2012

May 9th, Xiaopeng Li, Topological orbital ladders

Reference: http://arxiv.org/abs/1205.0254

Abstract: We unveil a topological phase of interacting fermions on a two-leg ladder of unequal parity orbitals, derived from the experimentally realized double-well lattices by dimension reduction. $Z_2$ topological invariant originates simply from the staggered phases of $sp$-orbital quantum tunneling, requiring none of the previously known mechanisms such as spin-orbit coupling or artificial gauge field. Another unique feature is that upon crossing over to two dimensions with coupled ladders, the edge modes from each ladder form a parity-protected flat band at zero energy, opening the route to strongly correlated states controlled by interactions. Experimental signatures are found in density correlations and phase transitions to trivial band and Mott insulators.

May 16th, Johannes Schachenmayer, Measuring entanglement growth in quench dynamics of bosons in a optical lattice

Reference: arXiv:1205.1521

I'll discuss our recent preprint.

Abstract: We discuss a scheme to measure the many-body entanglement growth during quench dynamics with bosonic atoms in optical lattices. By making use of a 1D or 2D setup in which two copies of the same state are prepared, we show how arbitrary order Renyi entropies can be extracted using tunnel-coupling between the copies and measurement of the parity of on-site occupation numbers, as has been performed in recent experiments. We illustrate these ideas for a Superfluid-Mott insulator quench in the Bose-Hubbard model, and also for hard-core bosons, and show that the scheme is robust against imperfections in the measurements.

July 6th, Xiaopeng Li, Exotic superconducting phases on the sp-orbital ladder

Reference: (1) X. Li's unpublished notes and (2) PRB 61, 2497 (2000) by U. Ledermann and K. Le Hur

July 10th, Andrew Daley, Steady-state spin squeezing in hot reactive fermions

Reference: To be posted

Spring 2012

Tuesday 12:30PM-2:30PM, 316 Allen Hall

Jan 10, Johannes Schachenmayer, Dynamical Crystal Creation With Polar Molecules or Rydberg Atoms in Optical Lattices

Reference: J. Schachenmayer, I. Lesanovsky, A. Micheli, and A. J. Daley, “Dynamical crystal creation with polar molecules or Rydberg atoms in optical lattices,” New Journal of Physics, vol. 12, no. 10, p. 103044, Oct. 2010.

http://iopscience.iop.org/1367-2630/12/10/103044/

Jan 17, Saubhik Sarkar, Quantum simulation of antiferromagnetic spin chains in an optical lattice

Reference: Nature 472, 307

Jan 24, Bin Wang, Probing Atomic Majorana Fermions in Optical Lattices

Reference: arXiv:1201.3253

CMT Faculty Candidate Lunch Talks

12:00PM - 1:00PM, 318 Allen

Jan 27, Friday, Wayne Witzel, Informal lunch discussion on "Simulating a Solid State Spin Qubit in a Spin Bath"

Jan 31, Tuesday, Kai Sun, Informal lunch discussion on "Topological Insulators, Topological Semimetals, and Quantum Hall effects without Landau Levels"

Feb 3, Friday, Doron Bergman, Informal lunch discussion on "The Topological Insulator in a Fermi Sea—Sink or Swim"

Feb 7, Tuesday, Suk Bum Chung, Informal lunch discussion on "Detecting Majorana Fermions in Topological Superconductors"

Feb 10, Friday, Alexey Gorshkov, Informal lunch discussion on "Many-body Physics with Atomic, Molecular, and Optical Systems and Methods"

Feb 14, Tuesday, Ying-Dan Wang, Informal lunch discussion on "Fighting against Thermal Noise in Quantum Opto- and Electro-mechanical Systems"

Feb 17, Friday, Liang Jiang, Informal lunch discussion on "Quantum Information Processing with Spins and Topological Quantum Systems"

Resume Group Meeting

Tuesday 12:30PM-2:30PM, 316 Allen Hall

Feb 21, March Meeting Rehearsal

Li, Xiaopeng, Time reversal symmetry breaking of p-orbital bosons in a one-dimensional optical lattice Schachenmayer, Johannes, Cold bosons in noisy optical lattices

Stefanus, Search for conformal invariance in 2-D compressible turbulence Wang, Bin, Quantum Dynamics of Population-Imbalanced Fermi Mixture in One-dimensional Optical Lattices

Feb 28, No group meeting (APS March Meeting)

Mar 6, Tuesday 12:30 316 Allen (Group Meeting), Adrian Kantian (University of Geneva), Mobile impurities in 1D cold gases

Mar 7, Wednesday 12:00 318 Allen (Pizza Lunch), Ulf Bissbort (University of Frankfurt), Quasi-particle theory and dynamics of strongly interacting bosons in optical lattices

Mar 13, Xiaopeng Li, A topological insulator without artificial gauge fields

Prof. W. Vincent Liu, Background gauge field approach to topological invariants in superconductivity

Mar 20, Prof. David Weiss (Penn State University), Informal discussion on "Experiments with Atoms in Optical Lattices"

Mar 27, Johannes Schachenmayer, Pink noisy lattices and the analytical Luttinger liquid methods from

Reference: Nature Physics 6, 806–810 (http://www.nature.com/nphys/journal/v6/n10/abs/nphys1754.html)

Reference: Keldysh Formalism

Reference: Giamarchi lecture notes

Apr 3, Bin Wang, Resonantly Tunable Majorana Polariton in a Microwave Cavity

Reference: arXiv:1202.2649

Reference: Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation, Phys. Rev. A 69, 062320 (2004)

Apr 10, No group meeting

Apr 17, Hannes Pichler (University of Innsbruck), Many-body dynamics of cold atoms in noisy optical lattices

Abstract: Cold atomic gases in optical lattices offer the possibility to study strongly correlated condensed matter systems and provide tools in the implementation of quantum information processing. A key challenge in experiments is that they require very low temperatures. We study different heating mechanisms in these setups and in this talk I present our results on heating arising due to classical (stochastic) fluctuations of the depth of the lattice potential. Further I present a lattice setup that allows minimizing or even canceling the heating effects of such fluctuations. If I have time in the end, I will briefly talk about an other project where we try to find schemes to measure entanglement (linear entropy) in many-body systems of cold atoms in optical lattices.

Apr 24, Saubhik Sarkar, Light-cone-like spreading of correlations in a quantum many-body system

Reference: http://www.nature.com/nature/journal/v481/n7382/full/nature10748.html

Theory part: Propagation front of correlations in an interacting Bose gas

Reference: http://arxiv.org/abs/1202.5558