Linear magnetoresistance induced by intra-scattering semiclassics of Bloch electrons
Linear magnetoresistance induced by intra-scattering semiclassics of Bloch electrons
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DOI：
10.1103/physrevb.101.201410
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发表时间：
2020-05-27
影响因子：
3.7
通讯作者：
Niu, Qian
中科院分区：
文献类型：
--
作者：
Xiao, Cong;Chen, Hua;Niu, Qian
由于布洛赫电子的动量-空间贝里曲率所起的独特作用，弱场磁电阻又引起了人们的兴趣。虽然在这方面的大多数以前的研究集中在电磁场中的半经典布洛赫电子的相互散射运动，半经典动力学增强的Berry曲率，磁矩和位移矢量的内散射效应的磁阻在很大程度上被忽视。在这里，我们发现，这些内散射效应，这是被忽略的场无关的弛豫时间近似的玻尔兹曼碰撞积分，可以作为重要的相互散射。对二维带隙Dirac模型的具体计算表明，当考虑磁矩和位移矢量时，仅由Berry曲率给出的负线性磁电阻的符号是相反的。
Weak-field magnetoresistance has seen a revived interest due to the distinct role played by the momentum-space Berry curvature of Bloch electrons. While most previous studies in this regard focus on the inter-scattering motion of semiclassical Bloch electrons in electromagnetic fields, the intra-scattering effects of the semiclassical dynamics augmented by the Berry curvature, magnetic moment, and shift vector on the magnetoresistance have been largely overlooked. Here, we uncover that these intra-scattering effects, which are neglected in the field-independent relaxation time approximation to the Boltzmann collision integral, can be as important as the inter-scattering ones. Concrete calculations on the two-dimensional gapped Dirac model show that the sign of the negative linear magnetoresistance given by the Berry curvature alone is reversed when one considers the magnetic moment and shift vector.