Enhanced Many-Body Quantum Scars from the Non-Hermitian Fock Skin Effect

被引:2
|
作者
Shen, Ruizhe [1 ]
Qin, Fang [1 ]
Desaules, Jean-Yves [2 ,3 ]
Papic, Zlatko [2 ]
Lee, Ching Hua [1 ]
机构
[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore
[2] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, England
[3] Inst Sci & Technol Austria ISTA, Campus 1, A-3400 Klosterneuburg, Austria
基金
新加坡国家研究基金会;
关键词
STATISTICAL-MECHANICS; THERMALIZATION; CHAOS;
D O I
10.1103/PhysRevLett.133.216601
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In contrast with extended Bloch waves, a single particle can become spatially localized due to the socalled skin effect originating from non-Hermitian pumping. Here we show that in kinetically constrained many-body systems, the skin effect can instead manifest as dynamical amplification within the Fock space, beyond the intuitively expected and previously studied particle localization and clustering. We exemplify this non-Hermitian Fock skin effect in an asymmetric version of the PXP model and show that it gives rise to ergodicity-breaking eigenstates-the non-Hermitian analogs of quantum many-body scars. A distinguishing feature of these non-Hermitian scars is their enhanced robustness against external disorders. We propose an experimental realization of the non-Hermitian scar enhancement in a tilted Bose-Hubbard optical lattice with laser-induced loss. Additionally, we implement digital simulations of such scar enhancement on the IBM quantum processor. Our results show that the Fock skin effect provides a powerful tool for creating robust nonergodic states in generic open quantum systems.
引用
收藏
页数:9
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