Real-time evolution and quantized charge pumping in magnetic Weyl semimetals
Real-time evolution and quantized charge pumping in magnetic Weyl semimetals
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DOI：
10.1103/physrevb.100.155123
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发表时间：
2019-07
影响因子：
3.7
通讯作者：
Takahiro Misawa;Ryota Nakai;K. Nomura
中科院分区：
文献类型：
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作者：
Takahiro Misawa;Ryota Nakai;K. Nomura
通过求解随时间变化的薛定谔方程，研究了磁性Weyl半金属的实时演化和电荷泵浦。在实时演化的绝热极限下，我们发现尽管Weyl半金属没有体隙，但总泵浦电荷在磁性Weyl半金属中量子化，就像在量子霍尔系统中一样。我们研究了无序如何影响电荷泵送。结果表明，量子化的泵浦电荷对小无序具有鲁棒性，并且在中间无序区泵浦电荷增加。我们还研究了掺杂对电荷泵送的影响，并表明在零掺杂时可以检测到量子化泵送电荷的残余。我们的研究结果表明，实时演化是一种有用的技术，用于检测无体隙和/或无序的系统的拓扑特性。
Real-time evolution and charge pumping in magnetic Weyl semimetals are studied by solving the time-dependent Schr\"{o}dinger equations. In the adiabatic limit of the real-time evolution, we show that the total pumped charge is quantized in the magnetic Weyl semimetals as in the quantum Hall system although the Weyl semimetal has no bulk gap. We examine how the disorder affects the charge pumping. As a result, we show that the quantized pumped charge is robust against the small disorder and find that the pumped charge increases in the intermediate disorder region. We also examine the doping effects on the charge pumping and show that the remnant of the quantized pumped charge at zero doping can be detected. Our results show that the real-time evolution is a useful technique for detecting the topological properties of the systems with no bulk gap and/or disorders.