各向异性带间散射引起的输运反常
Transport anomalies due to anisotropic interband scattering
摘要：
在多波段系统中，由于单粒子散射的各向异性，可能会出现意想不到的输运行为。具体而言，我们表明在一个半经典玻尔兹曼方法超越弛豫时间近似，类电子和类孔费米表面之间的各向异性散射一般导致负的传输时间，这反过来又导致负磁阻，霍尔系数的极值，和电阻率的降低。发生这种情况所需的各向异性随着费米表面半径之间的失配的增加而减小。
英文摘要：
Unexpected transport behavior can arise due to anisotropic single-particle scattering in multiband systems. Specifically, we show within a semiclassical Boltzmann approach beyond the relaxation-time approximation that anisotropic scattering between electronlike and holelike Fermi surfaces generically leads to negative transport times, which in turn cause negative magnetoresistance, an extremum in the Hall coefficient, and a reduction of the resistivity. The anisotropy required for this to occur decreases with increasing mismatch between the Fermi-surface radii.
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