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[Lecture] From quantum many-body scars to time crystals: entanglement steering via periodic driving
Sep. 25, 2023

Speaker: Maksym Serbyn (1ST Austria)

Time: 16:00-17:00 p.m., September 25, 2023, GMT+8


Zoom ID: 963 5796 8034 Password: 125125 蔻享直播:


In my talk I will discuss a new mechanism of the weak ergodicity breaking relevant for the experimentally realized Rydberg-atom quantum simulators [1]. This mechanism arises from the presenceof special eigenstates in the many-body spectrum that are reminiscentof quantum scars in chaotic non-interacting systems [2]. After review of different mechanisms that lead to scars, I will discuss more recent experiments [3] that demonstrated that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving generating stable subharmonic responses over a wide parameter regime. I will propose a simple model which explains experimentalphenomena by spatiotemporal ordering in an effective Floquet unitary, corresponding to discrete time-crystalline (DTC) behavior in aprethermal regime [4]. Unlike conventional DTC, the subharmonic response exists only for Neel-like initial states, associated with quantumscars. I will discuss robustness to perturbations and identify emergenttimescales that could be observed in future experiments [4].

[1] H. Bernien,et al,Nature 551,579-584(2017),arXiv:1707.043442]
[2] C. J. Turner et al, Nature Physics (May 2018), arXiv:1711.03528 and Phys. Rev. B98,155134 (2018) arXiv:1806.10933
[3] D Bluvstein,et al, Science 371,1355-1359 (2021), arXiv:2012.122764
[4] N Maskara et al., Phys. Rev. Lett.127, 090602 (2021), arXiv:2102.13160

Source: School of Physics