原子动量态的集体磁性
Collective magnetism of atomic momentum states
AI总结：
本文探索标量玻色量子气体激光耦合动量模式中的集体磁性，通过绝热态制备研究磁化对偏置势的响应，发现相互作用增强对基态和激发态响应的不同影响及基态Z₂对称性破缺，为量子传感中动量态压缩提供途径。
摘要：
多体系统中相互作用导致的有序化是我们理解经典和量子物质相的基础。磁性在多体相研究中尤为关键。本文探索标量玻色量子气体的两种激光耦合动量模式中涌现的集体磁性。我们采用绝热态制备方法，研究集体磁化对施加偏置势的响应，发现相互作用的相对增强分别使基态和激发态的响应增强和减弱。我们进一步发现基态样品磁化存在显著Z₂对称性破缺的证据，与预期的超越平均场行为一致。这些结果表明，标量玻色凝聚体的非线性相互作用可能为量子传感中动量态的压缩提供一条简单直接的途径。
英文摘要：
Organization and ordering from interactions in many-body systems underlies our understanding of phases of classical and quantum matter. Magnetism has played a particularly foundational role in the study of many-body phases. Here, we explore the collective magnetism that emerges from two laser-coupled momentum modes of a scalar bosonic quantum gas. We employ adiabatic state preparation and explore the collective magnetization response to an applied bias potential, finding that the relative increase of interactions leads to an enhanced and muted response for the ground state and excited state, respectively. We further find evidence for significant $Z_2$ symmetry breaking of the sample magnetization for the ground state, consistent with the expected beyond-mean-field behavior. These results suggest that the nonlinear interactions of scalar Bose condensates could provide a simple, direct path towards the squeezing of momentum states for quantum sensing.
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