R. G. Herb Condensed Matter Seminars |
Events During the Week of May 11th through May 18th, 2014
Monday, May 12th, 2014
- Quench dynamics of the anisotropic Heisenberg model through an exact approach
- Time: 4:30 pm - 5:30 pm
- Place: Chamberlin 5310
- Speaker: Wenshuo Liu, Rutgers University
- Abstract: In this talk I will present the analytical approach we developed for the study of the quench dynamics of the anisotropic Heisenberg model (XXZ model) on the infinite line. Our approach gives the exact time-dependent wavefunctions after a quench in an integral form for any initial state and for any anisotropy ∆ by means of a generalized Yudson contour representation. We calculate the evolution of several observables from two particular initial states: starting from a local N`eel state we calculate the time evolution of the antiferromagnetic order parameter --staggered magnetization; starting from a state with consecutive flipped spins (1) we calculate the evolution of the local magnetization and express it in terms of the propagation of magnons and bound state excitations; (2) we predict the evolution of the induced spin currents. These predictions can be confronted with experiments in ultracold gases in optical lattices. We also show how the “string” solutions of Bethe Ansatz equations emerge naturally from the contour approach.
- Host: Vavilov
Tuesday, May 13th, 2014
- No events scheduled
Wednesday, May 14th, 2014
- No events scheduled
Thursday, May 15th, 2014
- Realization of a Single-Cooper-Pair Josephson Laser
- Time: 10:00 am
- Place: 5310 Chamberlin Hall
- Speaker: Alex Rimberg, Dartmouth
- Abstract: The non-linear interaction of light with matter, long studied in the context of atomic systems, has recently been extended to condensed matter systems through the advent of quantum optical experiments based on superconducting circuits. Application of quantum optical techniques in this context has led to new regimes of ultrastrong coupling between light and matter, manipulation and readout of qubits, generation of quantum states of light and development of ultra-low-noise quantum amplifiers. A particularly familiar application of quantum optics is the laser, which in the single emitter regime has in atomic systems led to the production of pure photon number states and sub-Poissonian photon statistics. We have recently produced a device consisting of a Cooper pair transistor embedded in a high-Q superconducting microwave cavity (cCPT) that acts as a single emitter laser and may offer a path toward simple, continual production of non-classical photons. Similar devices may also allow for ultrastrong coupling of microwave photons to other quantum systems such as spin qubits and nanomechanical resonators.
- Host: Eriksson
Friday, May 16th, 2014
- No events scheduled