Chiral Edge States in Mesoscopic Superconductors

Chiral Edge States in Mesoscopic Superconductors
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介观超导体中的手性边缘态

DOI:
10.1109/tasc.2016.2593543
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发表时间:
2016-07
影响因子:
1.8
通讯作者:
Zhou Shi-Ping
Zhou Shi-Ping
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Lee Wan;Shi Liang-Ma;Zha Guo-Qiao;Zhou Shi-Ping

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通过求解一个修正的Bogliubov-de Gennes模型,研究了具有非局域表面散射的介观金属超导体的量子相变。结果表明,非局域表面散射效应可以在模型哈密顿量中引入自旋-轨道相互作用。手性边缘态可以在适当的自旋轨道耦合强度下出现。在外加轴向磁场作用下,手征边缘态与自旋单重态之间的竞争可以导致一系列的量子相变。当不同角量子数的态之间发生相变时,磁矩为四分之一玻尔磁振子常数。
Quantum phase transitions are studied by solving a modified Bogliubov-de Gennes model for mesoscopic metallic superconductors with nonlocal surface scatterings. It is found that the nonlocal surface scattering effect can induce a spin-orbit interaction into the model Hamiltonian. Chiral edge states can occur with the appropriate spin-orbit coupling strength. The competitions between the chiral edge states and the spin singlet superconducting states can result in a series of quantum phase transitions with the applied axial magnetic field. The magnetization moment is found to be a constant of one quarter Bohr magneto when the phase transition between states with different angular quantum numbers occurs.
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发表时间: 1991-04-01
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