Observation of interaction-induced mobility edge in a disordered atomic wire

• URL: http://arxiv.org/abs/2204.12730v1
• Date: Wed, 27 Apr 2022 06:57:12 GMT
• Title: Observation of interaction-induced mobility edge in a disordered atomic wire
• Authors: Yunfei Wang, Jia-Hui Zhang, Yuqing Li, Jizhou Wu, Wenliang Liu, Feng Mei, Ying Hu, Liantuan Xiao, Jie Ma, Cheng Chin, Suotang Jia
• Abstract summary: Mobility edge is a critical energy separating localized and extended excitations. We provide experimental evidence for mobility edge induced by interactions. Our work also offers new possibilities to engineer quantum transport and phase transitions in disordered systems.
• Score: 12.1129843814972
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Mobility edge, a critical energy separating localized and extended excitations, is a key concept for understanding quantum localization. Aubry-Andr\'{e} (AA) model, a paradigm for exploring quantum localization, does not naturally allow mobility edges due to self-duality. Using the momentum-state lattice of quantum gas of Cs atoms to synthesize a nonlinear AA model, we provide experimental evidence for mobility edge induced by interactions. By identifying the extended-to-localized transition of different energy eigenstates, we construct a mobility-edge phase diagram. The location of mobility edge in the low- or high-energy region is tunable via repulsive or attractive interactions. Our observation is in good agreement with the theory, and supports an interpretation of such interaction-induced mobility edge via a generalized AA model. Our work also offers new possibilities to engineer quantum transport and phase transitions in disordered systems.

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