论文标题
量子厅界面处的自旋活动通道的出现
Emergence of spin-active channels at a quantum Hall interface
论文作者
论文摘要
我们在量子厅制度中研究了$ν= 4 $和$ν= 3 $的接口的系统的基态。距离界面远处，对于一系列的交互强度，$ν= 3 $区域是完全两极化的，但$ν= 4 $区域是本地单元。在改变相互作用的强度和界面的宽度后，系统选择了两个不同的边缘/界面阶段之一。在A相稳定的宽接口中，自旋是一个良好的量子数，并且没有无间隙的长波自旋波动。在B相稳定的狭窄界面中，自旋对称性在Hartree-Fock水平上自发断裂。我们认为，超越了Hartree fock，认为B期是通过与界面结合的无间隙长波长旋转激发的出现来区分的，从原则上讲，可以通过测量核磁共振中的松弛时间$ T_2 $来检测。
We study the ground state of a system with an interface between $ν=4$ and $ν=3$ in the quantum Hall regime. Far from the interface, for a range of interaction strengths, the $ν=3$ region is fully polarized but $ν=4$ region is locally a singlet. Upon varying the strength of the interactions and the width of the interface, the system chooses one of two distinct edge/interface phases. In phase A, stabilized for wide interfaces, spin is a good quantum number, and there are no gapless long-wavelength spin fluctuations. In phase B, stabilized for narrow interfaces, spin symmetry is spontaneously broken at the Hartree-Fock level. Going beyond Hartree-Fock, we argue that phase B is distinguished by the emergence of gapless long-wavelength spin excitations bound to the interface, which can, in principle, be detected by a measurement of the relaxation time $T_2$ in nuclear magnetic resonance.
