在玻色碎核绝缘体和超流体之间持续过渡
Hongyu Lu1, Han-Qing Wu2, Bin-Bin Chen1
1The University of Hong Kong, Department of Physics and HK Institute of Quantum Science and Technology, Pokfulam Road, Hong Kong.
Physical review letters
|March 7, 2025
概括
这项研究表明,在玻色子系统中,部分切尔恩绝缘体 (FCI) 阶段和超流体 (SF) 状态之间存在连续的过渡. 这提供了直接的数值证据,证明了拓和折叠相之间的连续过渡,这对于超冷原子系统至关重要.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 关于物质的拓阶段
- 量子模拟的量子模拟
背景情况:
- 分数切尔恩绝缘体 (FCI) 阶段及其过渡到莫特绝缘体是众所周知的.
- 尽管有理论预测,但FCI和超流体 (SF) 之间的连续过渡缺乏直接的数值验证.
- 现有的FCI-SF转换的数值研究是间接的,或者表明一级转换.
研究的目的:
- 通过数值来证明玻色子分数切尔恩绝缘体 (FCI) 阶段和超流体 (SF) 状态之间的连续过渡.
- 通过调整 Haldane 蜂巢格子模型中的带宽来调查 FCI-SF 过渡的性质.
- 在超冷原子系统中实现拓相的直接实验途径.
主要方法:
- 对于玻色子系统,利用了哈尔丹的蜂格子模型.
- 调整了平面切尔恩带的带宽,以诱导相位过渡.
- 进行了有限尺寸的临界性分析并计算了双部分纠.
主要成果:
- 观察到从一个子FCI的v=1/2填充到两个SF状态的直接过渡 (在M或 Γ时刻凝结).
- 确定了一个连续的FCI-SF(Γ) 过渡,与第一阶段的FCI-SF(M) 过渡不同.
- 计算的临界指数 (β≈0.35(5), ν≈0.62(12)) 与3D XY普遍性类相一致.
结论:
- 介绍了在拓有序的FCI和破坏对称性的SF阶段之间连续过渡的第一个直接数值演示.
- 这些发现支持从SF状态通过超冷原子实验中的带平面化实现玻色子FCI的可能性.
- 观察到的关键指数表明了与既定和异国情调的普遍性类别的潜在联系.
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