Spin-orbital ground states of superconducting doped topological insulators: A Majorana platform
Spin-orbital ground states of superconducting doped topological insulators: A Majorana platform
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超导掺杂拓扑绝缘体的自旋轨道基态：马约拉纳平台
DOI：
10.1103/physrevb.83.224516
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
Hasan, M. Zahid
中科院分区：
文献类型：
--
作者：
Wray, L. Andrew;Lin, Hsin;Bansil, Arun;Fu, Liang;Xia, Yuqi;Cava, Robert J.;Fedorov, Alexei V.;Hor, Yew San;Qian, Dong;Xu, Suyang;Hasan, M. Zahid
${\mathrm{Bi}}_{2}$ ${\mathrm{Se}}_{3}$ 类拓扑绝缘体最近被证明在空穴或电子掺杂后会发生超导转变（${\mathrm{Cu}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Se}}_{3}$ ${\mathrm{T}}_{C}={3.8}^{\ifmmode^\circ\else\text Degree\fi{}}$K 和 ${\mathrm{Pd}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ 与${\mathrm{T}}_{C}={5.5}^{\ifmmode^\circ\else\text Degree\fi{}}$K)，提高了这些是“拓扑超导体”或实现可用作马约拉纳平台的超导状态的可能性。我们使用角分辨光电子能谱来检查能带结构的元素，这些元素决定了超导 ${\mathrm{Cu}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Se}}_{3}$ 和 ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ 的自旋轨道基态，观察到自旋动量锁定拓扑在最佳掺杂的 ${\mathrm{Cu}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Se}}_{3}$ 中，相对于费米能级的体电子态，表面态保持良好定义且非简并。讨论了这种非常规超导表面拓扑的含义，并探讨了在 ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ 超导变体中实现相同拓扑的可能性。对实验测量的三维体态的超导态和拓扑性质的特征进行了检查，表明单个马约拉纳费米子零模式预计会束缚在晶体表面上的每个超导涡旋处。系统测量还揭示了表面局域电子模式的有趣的重整化和电荷相关不稳定性。
The ${\mathrm{Bi}}_{2}$ ${\mathrm{Se}}_{3}$ class of topological insulators has recently been shown to undergo a superconducting transition upon hole or electron doping (${\mathrm{Cu}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Se}}_{3}$ with ${\mathrm{T}}_{C}={3.8}^{\ifmmode^\circ\else\textdegree\fi{}}$K and ${\mathrm{Pd}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$ with ${\mathrm{T}}_{C}={5.5}^{\ifmmode^\circ\else\textdegree\fi{}}$K), raising the possibilities that these are ``topological superconductors'' or realize a superconducting state that can be used as Majorana platform. We use angle resolved photoemission spectroscopy to examine elements of band structure that determine the spin-orbital ground states of superconducting ${\mathrm{Cu}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Se}}_{3}$ and ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$, observing that the spin-momentum locked topological surface states remain well defined and non-degenerate with respect to bulk electronic states at the Fermi level in optimally doped ${\mathrm{Cu}}_{x}$-${\mathrm{Bi}}_{2}$${\mathrm{Se}}_{3}$. The implications of this unconventional superconducting surface topology are discussed, and we explore the possibility of realizing the same topology in superconducting variants of ${\mathrm{Bi}}_{2}$${\mathrm{Te}}_{3}$. Characteristics of the experimentally measured three dimensional bulk states are examined with respect to the superconducting state and topological properties, showing that a single Majorana fermion zero mode is expected to be bound at each superconducting vortex on the crystal surface. Systematic measurements also reveal intriguing renormalization and charge correlation instabilities of the surface-localized electronic modes.
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影响因子：
64.8
作者：
Hsieh, D.;Qian, D.;Hasan, M. Z.
通讯作者：
Hasan, M. Z.
影响因子：
56.9
作者：
Nelson, KD;Mao, ZQ;Liu, Y
通讯作者：
Liu, Y
DOI：
10.1088/0953-8984/17/11/030
发表时间：
2005-03
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
Y. Kitaoka;H. Kotegawa;A. Harada;S. Kawasaki;Y. Kawasaki;Y. Haga;E. Yamamoto;Y. Ōnuki;K. Itoh;E. Haller;H. Harima
通讯作者：
Y. Kitaoka;H. Kotegawa;A. Harada;S. Kawasaki;Y. Kawasaki;Y. Haga;E. Yamamoto;Y. Ōnuki;K. Itoh;E. Haller;H. Harima
影响因子：
19.6
作者：
L. Wray;Su-Yang Xu;Yuqi Xia;D. Qian;A. Fedorov;Hsin Lin;A. Bansil;Y. Hor;R. Cava;M Zahid
通讯作者：
L. Wray;Su-Yang Xu;Yuqi Xia;D. Qian;A. Fedorov;Hsin Lin;A. Bansil;Y. Hor;R. Cava;M Zahid
影响因子：
56.9
作者：
Chen, Y. L.;Analytis, J. G.;Shen, Z. -X.
通讯作者：
Shen, Z. -X.