Weak antilocalization beyond the fully diffusive regime in Pb1−xSnxSe topological quantum wells
Weak antilocalization beyond the fully diffusive regime in Pb1−xSnxSe topological quantum wells
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DOI：
10.1103/physrevb.102.155307
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Jiashu Wang;X. Liu;C. Bunker;L. Riney;B. Qing;S. Bac;M. Zhukovskyi;T. Orlova;Sergei Rouvimov;M. Dobrowolska;J. Furdyna;B. Assaf
中科院分区：
文献类型：
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作者：
Jiashu Wang;X. Liu;C. Bunker;L. Riney;B. Qing;S. Bac;M. Zhukovskyi;T. Orlova;Sergei Rouvimov;M. Dobrowolska;J. Furdyna;B. Assaf
在弹性散射长度大于磁性长度的新机制下，对Pb_（1-x）Sn_xSe拓扑量子威尔斯阱中的弱反定域（WAL）进行了测量和分析.我们通过发展高质量的外延和掺杂的拓扑晶体绝缘体（TCI）量子威尔斯。我们得到的弹性散射长度超过100 nm，并成为可比的磁性长度。在这种输运状态下，Hikami-Larkin-Nagaoka模型不再有效。我们采用Wittmann和Schmid的模型从磁电阻中提取相干时间。我们发现，尽管我们改进的传输特性，相干时间可能是有限的散射通道，是不是强烈的载流子依赖性，如电子-声子或缺陷散射。
We report the measurements and analysis of weak antilocalization (WAL) in Pb1-xSnxSe topological quantum wells in a new regime where the elastic scattering length is larger than the magnetic length. We achieve this regime through the development of high-quality epitaxy and doping of topological crystalline insulator (TCI) quantum wells. We obtain elastic scattering lengths that exceeds 100nm and become comparable to the magnetic length. In this transport regime, the Hikami-Larkin-Nagaoka model is no longer valid. We employ the model of Wittmann and Schmid to extract the coherence time from the magnetoresistance. We find that despite our improved transport characteristics, the coherence time may be limited by scattering channels that are not strongly carrier dependent, such as electron-phonon or defect scattering.