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arXiv 1912.01465cond-mat.mes-hall
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可调谐量子干涉效应对少层黑磷磁导率的影响

Tunable quantum interference effect on magnetoconductivity in few-layer black phosphorus

Sunghoon Kim, Hongki Min

摘要:

在这项研究中,我们发展了一个系统的弱局域化/反局域化理论,充分考虑到系统的各向异性和Berry相,并将其应用到各相的少层黑磷(BP),它具有高度各向异性的电子结构,电子间隙的大小可调甚至为负值。推导了一般各向异性系统中Bethe-Salpeter方程的Cooperon近似,揭示了在少层BP的不同阶段存在各种量子干涉效应,包括从弱局域化到反局域化的交叉.我们还预测,在半狄拉克转变点的磁导率将表现出一个非平凡的幂律依赖于磁场,而按照传统的对数场依赖的二维系统在绝缘体和狄拉克半金属相。值得注意的是,即使在强各向异性系统中,磁导率和玻尔兹曼电导率之间的比率也与方向无关。最后,我们根据系统的对称性讨论了少层BP量子修正的可调性。

英文摘要:

In this study, we develop a systematic weak localization/antilocalization theory fully considering the anisotropy and Berry phase of the system, and apply it to various phases of few-layer black phosphorus (BP), which has a highly anisotropic electronic structure with an electronic gap size tunable even to a negative value. The derivation of a Cooperon ansatz for the Bethe-Salpeter equation in a general anisotropic system is presented, revealing the existence of various quantum interference effects in different phases of few-layer BP, including a crossover from weak localization to antilocalization. We also predict that the magnetoconductivity at the semi-Dirac transition point will exhibit a nontrivial power-law dependence on the magnetic field, while following the conventional logarithmic field-dependence of 2D systems in the insulator and Dirac semimetal phases. Notably, the ratio between the magnetoconductivity and Boltzmann conductivity turns out to be independent of the direction, even in strongly anisotropic systems. Finally, we discuss the tunability of the quantum corrections of few-layer BP in terms of the symmetry class of the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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