Impurity effect on surface states of Bi (111) ultrathin films

Impurity effect on surface states of Bi (111) ultrathin films
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杂质对Bi(111)超薄膜表面态的影响

DOI:
10.1088/1674-1056/25/8/087303
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发表时间:
2016-06
期刊:
影响因子:
1.7
通讯作者:
Jin Xiaofeng
Jin Xiaofeng
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhu Kai;Tian Dai;Wu Lin;Xu Jianli;Jin Xiaofeng

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用低温磁输运测量方法研究了外延Bi111薄膜中表面杂质对表面态电导和弱反局域化效应的影响。表面杂质Cu、Fe和Co显著降低了表面态电导率。磁输运数据表明,观测到的WAl对非磁性杂质的沉积具有很强的抵抗力,但由于磁性杂质的沉积破坏了时间反转对称性,它被猝灭了。我们的结果有助于阐明表面杂质对二维表面电子系统的电子和自旋输运性质的影响。
The surface impurity effect on the surface-state conductivity and weak antilocalization (WAL) effect has been investigated in epitaxial Bi (111) films by magnetotransport measurements at low temperatures. The surface-state conductivity is significantly reduced by the surface impurities of Cu, Fe, and Co. The magnetotransport data demonstrate that the observed WAL is robust against deposition of nonmagnetic impurities, but it is quenched by the deposition of magnetic impurities which break the time reversal symmetry. Our results help to shed light on the effect of surface impurities on the electron and spin transport properties of a 2D surface electron systems.
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