Surface state conductivity in epitaxially grown Bi1−xSbx(111) films
Surface state conductivity in epitaxially grown Bi1−xSbx(111) films
复制标题
外延生长 Bi1âxSbx(111) 薄膜的表面态电导率
DOI:
10.1088/1367-2630/18/9/093012
复制
发表时间:
2016
影响因子:
3.3
通讯作者:
C. Tegenkamp
中科院分区:
文献类型:
--
作者:
J. Koch;P. Kröger;H. Pfnür;C. Tegenkamp
Topologically non-trivial surface states were reportedfirst on-Bi x 1 Sbx bulk crystals. In this study we present transport measurements performed on thin-Bi x 1 Sbx-films (up to 24 nm thickness) grown epitaxially on Si (111) with various Sb-concentrations (up tox= 0.22). The analysis of the temperature dependency allowed us to distinguish between different transport channels originating from surface and bulk bands as well as impurity states. At temperatures below 30 K the transport is mediated by surface states while at higher temperatures activated transport via bulk channels sets in. The surface state conductivity and bulk band gaps can be tuned by the Sb-concentration andfilm thickness, respectively. Forfilms as thin as 4 nm the surface state transport is strongly suppressed in contrast to Bi (111) films grown under identical conditions. The impurity channel is of intrinsic origin due to the growth and alloy formation process and turns out to be located at the buried interface.
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DOI:
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发表时间:
1969
期刊:
影响因子:
--
作者:
K. Berchtold;D. Huber
通讯作者:
D. Huber
影响因子:
56.9
作者:
Xu, Su-Yang;Belopolski, Ilya;Hasan, M. Zahid
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DOI:
--
发表时间:
2012
期刊:
影响因子:
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Shuang Tang;M. Dresselhaus
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DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
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