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arXiv 2409.14941cond-mat.mes-hall
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狄拉克半金属的磁导率与手性磁效应的Keldysh技术研究

Magnetoconductivity of Dirac semimetals and chiral magnetic effect from Keldysh technique

Ariel University(阿里尔大学)

R. A. Abramchuk, M. A. Zubkov

AI总结:

本研究利用Keldysh技术分析狄拉克半金属的磁导率,证实强磁场下磁导率源于手性磁效应。

摘要:

狄拉克半金属中的负磁电阻通常被认为是手性磁效应(CME)的表现。这两种现象之间的关系目前仍处于假设阶段,基于一系列假设。我们依赖非平衡理论的Keldysh技术。该技术使我们能够研究轴向电荷的积累过程,这一过程涉及手性异常和随后的弛豫以及能量耗散。我们考虑强磁场的情况,并直接计算轴向电荷密度和电导率,同时考虑杂质散射和声子相互作用。我们得到轴向电荷密度对电场和磁场的依赖关系,以及电流对轴向电荷密度的依赖关系,与标准启发式CME计算相同。这证实了(在强磁场极限下)狄拉克半金属中磁导率的起源是手性磁效应的假设。

英文摘要:

Negative magnetoresistance in Dirac semimetals is typically considered as a manifestation of chiral magnetic effect (CME). The relation between these two phenomena has the status of a hypothesis and is based on sequence of assumptions. We rely on the Keldysh technique of non-equilibrium theory. It allows us to investigate the accumulation of axial charge -- the process that involves both chiral anomaly and relaxation followed by the energy dissipation. We consider the case of strong magnetic field and calculate directly both axial charge density and electric conductivity taking into account both scattering on impurities and interaction with phonons. We obtain the same dependence of axial charge density on electric and magnetic fields, and the same dependence of electric current on axial charge density as the standard heuristic CME calculation. This confirms (in the limit of strong magnetic fields) the hypothesis that the origin of magnetoconductivity in Dirac semimetals is the CME.

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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