Influence of an Anomalous Temperature Dependence of the Phase Coherence Length on the Conductivity of Magnetic Topological Insulators.
Influence of an Anomalous Temperature Dependence of the Phase Coherence Length on the Conductivity of Magnetic Topological Insulators.
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DOI：
10.1103/physrevlett.123.036406
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发表时间：
2018-06
影响因子：
8.6
通讯作者：
V. Tkáč;K. Výborný;V. Komanický;J. Warmuth;M. Michiardi;Arlette S. Ngankeu;M. Vondráček;R. Tarasenko;M. Vališka;V. Stetsovych;K. Carva;I. Garate;M. Bianchi;J. Wiebe;V. Holý;P. Hofmann;G. Springholz;V. Sechovský;J. Honolka
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作者：
V. Tkáč;K. Výborný;V. Komanický;J. Warmuth;M. Michiardi;Arlette S. Ngankeu;M. Vondráček;R. Tarasenko;M. Vališka;V. Stetsovych;K. Carva;I. Garate;M. Bianchi;J. Wiebe;V. Holý;P. Hofmann;G. Springholz;V. Sechovský;J. Honolka
磁输运是了解自旋电子器件中电子能带拓扑和磁性之间相互作用的有用探针。近代的陆神学说[物理学]。在磁掺杂拓扑绝缘体上的量子修正Δκ预测电导率的温度依赖性可以在居里跃迁中改变符号。这种现象归因于拓扑表面态的贝里相在费米能级的抑制，这是由磁能隙引起的。在这里，我们通过实验证明，即使费米能级的贝里相保持不变，Δκ也可以反转其符号。通过将Lu和Shen的模型扩展到非弹性散射长度的非单调温度标度，在居里跃迁处显示一个转折点，解决了理论预测的矛盾行为。
Magnetotransport constitutes a useful probe to understand the interplay between electronic band topology and magnetism in spintronic devices. A recent theory of Lu and Shen [Phys. Rev. Lett. 112, 146601 (2014)PRLTAO0031-900710.1103/PhysRevLett.112.146601] on magnetically doped topological insulators predicts that quantum corrections Δκ to the temperature dependence of conductivity can change sign across the Curie transition. This phenomenon has been attributed to a suppression of the Berry phase of the topological surface states at the Fermi level, caused by a magnetic energy gap. Here, we demonstrate experimentally that Δκ can reverse its sign even when the Berry phase at the Fermi level remains unchanged. The contradictory behavior to theory predictions is resolved by extending the model by Lu and Shen to a nonmonotonic temperature scaling of the inelastic scattering length showing a turning point at the Curie transition.