Quantum Oscillations in the Topological Superconductor Candidate Cu0.25Bi2Se3

被引：51
作者：
Lawson, Ben J. [1 ]
Hor, Y. S. [2 ]
Li, Lu [1 ]
机构：
[1] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[2] Missouri Univ Sci & Technol, Dept Phys, Rolla, MO 65409 USA
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 22期
基金：
美国国家科学基金会;
关键词：
SINGLE DIRAC CONE; INSULATOR; SURFACE; BI2TE3; STATE;
D O I：
10.1103/PhysRevLett.109.226406
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In Cu0.25Bi2Se3, 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 Cu0.25Bi2Se3. The doping of Cu in Bi2Se3 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 Cu0.25Bi2Se3 as that in Bi2Se3. Our results imply that the insertion of Cu does not change the band structure and that conduction electrons in Cu doped Bi2Se3 sit in the linear Dirac-like band.
引用
收藏
页数：5
相关论文
共 34 条
[1]  
Analytis JG, 2010, NAT PHYS, V6, P960, DOI [10.1038/nphys1861, 10.1038/NPHYS1861]
[2]   Bulk Fermi surface coexistence with Dirac surface state in Bi2Se3: A comparison of photoemission and Shubnikov-de Haas measurements [J].
Analytis, James G. ;
Chu, Jiun-Haw ;
Chen, Yulin ;
Corredor, Felipe ;
McDonald, Ross D. ;
Shen, Z. X. ;
Fisher, Ian R. .
PHYSICAL REVIEW B, 2010, 81 (20)
[3]   THEORY OF DIRTY SUPERCONDUCTORS [J].
ANDERSON, PW .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1959, 11 (1-2) :26-30
[4]   Quantum Interference in Macroscopic Crystals of Nonmetallic Bi2Se3 [J].
Checkelsky, J. G. ;
Hor, Y. S. ;
Liu, M. -H. ;
Qu, D. -X. ;
Cava, R. J. ;
Ong, N. P. .
PHYSICAL REVIEW LETTERS, 2009, 103 (24)
[5]   Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3 [J].
Chen, Y. L. ;
Analytis, J. G. ;
Chu, J. -H. ;
Liu, Z. K. ;
Mo, S. -K. ;
Qi, X. L. ;
Zhang, H. J. ;
Lu, D. H. ;
Dai, X. ;
Fang, Z. ;
Zhang, S. C. ;
Fisher, I. R. ;
Hussain, Z. ;
Shen, Z. -X. .
SCIENCE, 2009, 325 (5937) :178-181
[6]   Angular-dependent oscillations of the magnetoresistance in Bi2Se3 due to the three-dimensional bulk Fermi surface [J].
Eto, Kazuma ;
Ren, Zhi ;
Taskin, A. A. ;
Segawa, Kouji ;
Ando, Yoichi .
PHYSICAL REVIEW B, 2010, 81 (19)
[7]   EXPERIMENTAL-EVIDENCE FOR A TRANSVERSE MAGNETIZATION OF THE ABRIKOSOV LATTICE IN ANISOTROPIC SUPERCONDUCTORS [J].
FARRELL, DE ;
WILLIAMS, CM ;
WOLF, SA ;
BANSAL, NP ;
KOGAN, VG .
PHYSICAL REVIEW LETTERS, 1988, 61 (24) :2805-2808
[8]   Topological insulators in three dimensions [J].
Fu, Liang ;
Kane, C. L. ;
Mele, E. J. .
PHYSICAL REVIEW LETTERS, 2007, 98 (10)
[9]   Odd-Parity Topological Superconductors: Theory and Application to CuxBi2Se3 [J].
Fu, Liang ;
Berg, Erez .
PHYSICAL REVIEW LETTERS, 2010, 105 (09)
[10]   Superconducting proximity effect and Majorana fermions at the surface of a topological insulator [J].
Fu, Liang ;
Kane, C. L. .
PHYSICAL REVIEW LETTERS, 2008, 100 (09)
1234