Quantum oscillations in the topological superconductor candidate Cu(0.25)Bi2Se3.
Quantum oscillations in the topological superconductor candidate Cu(0.25)Bi2Se3.
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DOI：
10.1103/physrevlett.109.226406
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发表时间：
2012-07
影响因子：
8.6
通讯作者：
B. Lawson;Y. Hor;Lu Li
中科院分区：
文献类型：
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作者：
B. Lawson;Y. Hor;Lu Li
拓扑绝缘体的电子结构通常是通过量子振荡来研究的。在拓扑超导体的主要候选者Cu（0.25）Bi（2）Se（3）中，磁输运测量中仍然没有观察到量子振荡。然而，使用扭矩磁力计，在Cu（0.25）Bi（2）Se（3）中观察到量子振荡（de Haas-van Alphen效应）。Cu的掺杂在Bi（2）Se（3）中增加了载流子密度和有效质量，而没有增加散射率或减小平均自由程，并且Cu（0.25）Bi（2）Se（3）中的费米速度与Bi（2）Se（3）中的费米速度相同。结果表明，Cu的引入并没有改变Bi（2）Se（3）的能带结构，Cu掺杂Bi（2）Se（3）的导电子位于类Dirac带中.
Quantum oscillations are generally studied to resolve the electronic structure of topological insulators. In Cu(0.25)Bi(2)Se(3), the prime candidate of topological superconductors, quantum oscillations are still not observed in magnetotransport measurement. However, using torque magnetometry, quantum oscillations (the de Haas-van Alphen effect) were observed in Cu(0.25)Bi(2)Se(3). The doping of Cu in Bi(2)Se(3) increases the carrier density and the effective mass without increasing the scattering rate or decreasing the mean free path. In addition, the Fermi velocity remains the same in Cu(0.25)Bi(2)Se(3) as that in Bi(2)Se(3). Our results imply that the insertion of Cu does not change the band structure and that conduction electrons in Cu doped Bi(2)Se(3) sit in the linear Dirac-like band.