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arXiv 1907.07971cond-mat.mes-hall
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局域v = 1量子Hall态的两步击穿

Two-step breakdown of a local v = 1 quantum Hall state

Masayuki Hashisaka, Koji Muraki, Toshimasa Fujisawa

摘要:

本文报道了AlGaAs/GaAs异质结中体材料v_bulk = 2系统中局域填充因子v_local = 1态的量子霍尔效应击穿。当有限的源极-漏极偏置施加在局部系统上时,击穿分两步发生。在低偏压下,通过v_local = 1系统的量子化电导由于边缘间电子隧穿而击穿。在高偏置下,v_local = 1系统的不可压缩性被打破,因为自旋能隙关闭。这两个步骤是解决相结合的测量,连续检测的核磁共振和散粒噪声,它允许一个评估电子自旋极化在本地系统和自旋相关的电荷输运通过系统,分别。

英文摘要:

We report quantum Hall effect breakdown of a local filling factor v_local = 1 state formed in a bulk v_bulk = 2 system in an AlGaAs/GaAs heterostructure. When a finite source-drain bias is applied across the local system, the breakdown occurs in two steps. At low bias, quantized conductance through the v_local = 1 system breaks down due to inter-edge electron tunneling. At high bias, the incompressibility of the v_local = 1 system breaks down because the spin gap closes. The two steps are resolved by combining measurements of resistively detected nuclear magnetic resonance and shot noise, which allows one to evaluate electron spin polarization in the local system and spin-dependent charge transport through the system, respectively.

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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