The weak-field magnetoresistance is calculated in tellurene and related two-dimensional systems, characterized by interacting two bands having parabolic dispersion with their centers displaced from each other. Scatterers with short-range potential are assumed. In a Boltzmann theory, positive magnetoresistance appears in the direction of the band displacement near the bottom of the band gap with saddle-point dispersion and below the bottom of the second band. The magnetoresistance in the perpendicular direction remains small except within the gap. In a self-consistent Born approximation, the positive magnetoresistance is enhanced near the saddle point due to effects of magnetic breakdown. The change in the density of states due to diamagnetic shift of the energy bands, responsible to the diamagnetic susceptibility, causes a sharp drop of the magnetoresistance at the bottom of the second band and a broad dip at the saddle-point energy in both directions.

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碲烯的磁阻理论及相关的微间隙系统

弱场磁阻是在碲烷和相关的二维系统中计算的，其特征是使具有抛物线色散的两个带相互中心偏移。假定具有短程电势的散射体。在玻耳兹曼理论中，正磁致电阻出现在带位移的方向附近，该带隙的底部靠近具有鞍点色散的带隙底部，而低于第二个带的底部。除了间隙之外，垂直方向的磁阻保持很小。在自洽Born近似中，由于磁击穿的影响，正电子磁阻在鞍点附近增强。由于能带的反磁性移动而引起的态密度变化，这与反磁性的敏感性有关，