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arXiv 2009.10539cond-mat.mes-hallcond-mat.str-el
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量子霍尔界面上自旋激活沟道的出现

Emergence of spin-active channels at a quantum Hall interface

Amartya Saha, Suman Jyoti De, Sumathi Rao, Yuval Gefen, Ganpathy Murthy

摘要:

我们研究了在量子霍尔体系中,在$ν=4$和$ν=3$之间存在界面的系统的基态.远离界面,对于一系列的相互作用强度,$ν=3$区域是完全极化的,但$ν=4$区域是局部的单线态。在改变相互作用的强度和界面的宽度时,系统选择两个不同的边缘/界面相之一。在相A中,对于宽界面稳定,自旋是一个好的量子数,并且不存在无间隙的长波长自旋涨落。在相B中,稳定的窄界面,自旋对称性自发地在Hartree-Fock水平被打破。超越Hartree-Fock,我们认为,相位B的区别是出现无隙长波长自旋激发绑定到界面,这可以,在原则上,通过测量的弛豫时间$T_2$在核磁共振。

英文摘要:

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.

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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