Group Meetings Schedule 2022
Jan 12 Zhesen Yang, "Non-Hermitian skin effect and generalized Brillouin zone theory" Wednesday 7:00 pm Pitt time (Jan 13, 8:00 am Beijing time)
Jan 26, Yi Peng, Wednesday 7:00 pm Pitt time (Jan 27, 8:00 am Beijing time)
Feb 16, Sayan Choudhury, Wednesday 7:00 pm Pitt time (Feb 17, 8:00 am Beijing time)
Feb 23, Georg Engelhardt, Wednesday 7:00 pm Pitt time (Feb 24, 8:00 am Beijing time)
Mar 9, Yucheng Wang, Wednesday 7:00 pm Pitt time (Mar 10, 8:00 am Beijing time)
Daylight Savings Begin
Mar 23, Yi Peng, Wednesday 8:00 pm Pitt time (Mar 24, 8:00 am Beijing time)
Apr 6, Sayan Choudhury, Wednesday 8:00 pm Pitt time (Apr 7, 8:00 am Beijing time)
"Programmable interactions and emergent geometry in an array of atom clouds"
Apr 27, Georg Engelhardt, Wednesday 8:00 pm Pitt time (Apr 21, 8:00 am Beijing time)
May 11, Yucheng Wang, Wednesday 8:00 pm Pitt time (May 12, 8:00 am Beijing time)
Summer Schedule begins
June 8, Biao Huang, Wednesday 8:00 pm Pitt time (June 9, 8:00 am Beijing time)
Title: Discrete time crystals enforced by Floquet-Bloch scars
Abstract: The discrete time crystal (DTC) relying on many-body localization or prethermal conditions has been explored theoretically early on, and its features have been further clarified in a set of new experiments over the past 2 years. However, the experimental and numerical observation of corresponding phenomena in translation-invariant (clean) systems with initial states defying prethermal conditions have remained a puzzle so far. Little is known about their underlying mechanism. In this talk, I will show an analytical solution to such a problem based on the strong-drive and strong-interaction Floquet perturbation theory. It is demonstrated that spatiotemporal translation symmetry can protect a special class of "Floquet-Bloch scar" (FBS) states, which are a rare type of Floquet eigenstates violating ergodicity. Crucially, under rather generic perturbations, it is the quasienergy level spacing between pairs of FBS that are protected. This is vitally different from (quasi-)static many-body scars relying on microscopic details to protect each scar level. We also demonstrate experimental proposals and numerical studies based on the trimerized kagome and dimerized honeycomb platforms related to the latest development in the Berkeley laboratory. Our work paves the way to the long-sought analytical understanding of generic DTCs in clean systems.
July 6, Yi Peng, Wednesday 8:00 pm Pitt time (July 7, 8:00 am Beijing time)
August 10, Sayan Choudhury, Wednesday 8:00 pm Pitt time (August 11, 8:00 am Beijing time)
Fall schedule begins
August 31, Georg Engelhardt, Wednesday 8:00 pm Pitt time (September 1, 8:00 am Beijing time)
September 21, Yi Peng, Wednesday 8:00 pm Pitt time (September 22, 8:00 am Beijing time)
October 5, Sayan Choudhury, Wednesday 8:00 pm Pitt time (October 6, 8:00 am Beijing time)
October 26, Georg Engelhardt, Wednesday 8:00 pm Pitt time (October 27, 8:00 am Beijing time)
Group Meeting Time Change
November 2, Krishna Prahlaadh Ramachandran, Wednesday 9:00 pm Pitt time (November 3, 9:00 am Beijing time)
Daylight Savings Ends
November 16, Yi Peng, Wednesday 8:00 pm Pitt time (November 17, 9:00 am Beijing time)
November 30, Krishna Prahlaadh Ramachandran, Wednesday 8:00 pm Pitt time (December 1, 9:00 am Beijing time)
December 14, Amit Bhoonah, Wednesday 8:00 pm Pitt time (December 15, 9:00 am Beijing time)
