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arXiv 1503.06224cond-mat.mes-hall
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带隙三维拓扑绝缘体中Berry相和动量弛豫时间的非拓扑分量计算

The evaluation of non-topological components in Berry phase and momentum relaxation time in a gapped 3D topological insulator

Parijat Sengupta, Gerhard Klimeck, Enrico Bellotti

摘要:

三维拓扑绝缘体的零能隙表面态是自旋锁定在动量上的狄拉克费米子。无隙狄拉克费米子表现出与传统材料中预测的不同的电子行为。虽然基于简单线性色散的计算可以解释观察到的实验模式,但通过在哈密顿量中包括高阶$ \overrightarrow{k}$项来获得更精确的匹配。在这项工作中,在存在的时间反演对称性破缺的外部磁场和高阶翘曲项,改变拓扑预定的Berry相位的$ (2n + 1)π$,动量弛豫时间,和磁导率张量的建立。

英文摘要:

The zero gap surface states of a 3D-topological insulator host Dirac fermions with spin locked to the momentum. The gap-less Dirac fermions exhibit electronic behaviour different from those predicted in conventional materials. While calculations based on a simple linear dispersion can account for observed experimental patterns, a more accurate match is obtained by including higher order $ \overrightarrow{k}$ terms in the Hamiltonian. In this work, in presence of a time reversal symmetry breaking external magnetic field and higher order warping term, alteration to the topologically ordained Berry phase of $ (2n + 1)π$, momentum relaxation time, and the magneto-conductivity tensors is established.

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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