Anisotropic quantum confinement effect and electric control of surface states in Dirac semimetal nanostructures.
Anisotropic quantum confinement effect and electric control of surface states in Dirac semimetal nanostructures.
复制标题
狄拉克半金属纳米结构的各向异性量子约束效应及表面态电控制
DOI:
10.1038/srep07898
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发表时间:
2015-01-20
影响因子:
4.6
通讯作者:
Zhou G
中科院分区:
文献类型:
--
作者:
Xiao X;Yang SA;Liu Z;Li H;Zhou G
The recent discovery of Dirac semimetals represents a new achievement in our fundamental understanding of topological states of matter. Due to their topological surface states, high mobility and exotic properties associated with bulk Dirac points, these new materials have attracted significant attention and are believed to hold great promise for fabricating novel topological devices. For nanoscale device applications, effects from finite size usually play an important role. In this report, we theoretically investigate the electronic properties of Dirac semimetal nanostructures. Quantum confinement generally opens a bulk band gap at the Dirac points. We find that confinement along different directions shows strong anisotropic effects. In particular, the gap due to confinement along verticalc-axis shows a periodic modulation, which is absent for confinement along horizontal directions. We demonstrate that the topological surface states could be controlled by lateral electrostatic gating. It is possible to generate Rashba-like spin splitting for the surface states and to shift them relative to the confinement-induced bulk gap. These results will not only facilitate our fundamental understanding of Dirac semimetal nanostructures, but also provide useful guidance for designing all-electrical topological spintronics devices.
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影响因子:
56.9
作者:
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通讯作者:
Zhang, Shou-Cheng
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Zhou XJ
影响因子:
3.7
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影响因子:
8.6
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通讯作者:
Cava, Robert J.
影响因子:
41.2
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Liu, Z. K.;Jiang, J.;Chen, Y. L.
通讯作者:
Chen, Y. L.