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arXiv 1803.04429cond-mat.quant-gascond-mat.str-elphysics.atom-ph
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p轨道玻色子自旋与angular momentum的旋转对称强迫耦合

Rotation-symmetry-enforced coupling of spin and angular momentum for p-orbital bosons

Yongqiang Li, Jianmin Yuan, Andreas Hemmerich, Xiaopeng Li

摘要:

电子的内禀自旋角动量耦合具有相对论量子起源,其耦合产生于带电轨道,不携带到电荷中性原子。本文提出了一种自旋角动量耦合的自发产生机制,即自旋原子玻色子被加载到二维光晶格的$p$轨道带中。这种自旋角动量耦合源于超流体中的多体关联和自发对称性破缺,其关键成分归因于自旋通道量子涨落和近似旋转对称性。由此产生的自旋角动量纠缠超流体具有狄拉克激发。在相邻位点存在化学电势差的情况下,它提供了一种玻色子类似物,是一种受保护的拓扑绝缘体。通过动力学平均场计算,发现这种新的超流体是一种普通的低温相,并且只有在强相互作用和偶数整数填充时才让位于Mott局域化.我们表明,达到这个顺序的温度是可用目前的实验。

英文摘要:

Intrinsic spin angular-momentum coupling of an electron has a relativistic quantum origin with the coupling arising from charged-orbits, which does not carry over to charge-neutral atoms. Here we propose a mechanism of spontaneous generation of spin angular-momentum coupling with spinor atomic bosons loaded into $p$-orbital bands of a two-dimensional optical-lattice. This spin angular-momentum coupling originates from many-body correlations and spontaneous symmetry breaking in a superfluid, with the key ingredients attributed to spin-channel quantum fluctuations and an approximate rotation symmetry. The resultant spin angular-momentum intertwined superfluid has Dirac excitations. In presence of a chemical potential difference for adjacent sites, it provides a bosonic analogue of a symmetry-protected-topological insulator. Through a dynamical mean-field calculation, this novel superfluid is found to be a generic low-temperature phase, and it gives way to Mott localization only at strong interactions and even-integer fillings. We show the temperature to reach this order is accessible with present experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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