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Floquet Time Crystals Made Clean

Date: 2018-08-20
Time: 10:00
Venue: 物理所M830
Speaker: Biao Huang (黄飙)

University of Pittsburgh

Abstract: It is usually expected that interacting quantum systems subject to strong driving will quickly enter the chaotic regime, where the constant absorption of energy leads to a featureless, infinite-temperature state without any dynamics. The discovery of the time crystal phases in disordered systems, however, points out the existence of persistent and ordered dynamics in such a non-equilibrium setting. In this talk, I will discuss the recent development in the Floquet time crystal phases which do not require any disorders, as opposed to the original versions. This leads to the exciting new possibility that Floquet dynamics is able to generate its own integrability and the ability to resist heating. Further, without the need for disorders, a wide range of systems become viable to hold the time crystal phases. Among them, I will discuss in detail an ongoing collaboration with the Berkeley cold atom experimental group for observing the spacetime density waves, a time crystal phase induced by spatial band-dispersions, in the trimerized kagome optical lattices.

Reference: Biao Huang, et al., Phys. Rev. Lett. 120, 110603 (2018)

Biao Huang received PhD in physics in 2016 from the Ohio-State University, under the supervision of Tin-Lun Ho. He then worked as a postdoc with W. Vincent Liu in the University of Pittsburgh. His research interest includes dynamical phases, large spin quantum gases, synthetic gauge fields, classification and detection of quantum spin liquids etc.