Band Structure of Topological Insulator BiSbTe1.25Se1.75

被引：16

作者：

Lohani, H. ^{[1
,2
]}

Mishra, P. ^{[1
]}

Banerjee, A. ^{[3
]}

Majhi, K. ^{[3
]}

Ganesan, R. ^{[3
]}

Manju, U. ^{[4
]}

Topwal, D. ^{[1
,2
]}

Kumar, P. S. Anil ^{[3
]}

Sekhar, B. R. ^{[1
,2
]}

机构：

[1] Inst Phys, Sachivalaya Marg, Bhubaneswar 751005, Orissa, India

[2] Homi Bhabha Natl Inst, Training Sch Complex,Anushakti Nagar, Mumbai 400085, Maharashtra, India

[3] Indian Inst Sci, Bangalore 560012, Karnataka, India

[4] CSIR Inst Minerals & Mat Technol, Bhubaneswar 751005, Orissa, India

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

关键词：

GENERALIZED GRADIENT APPROXIMATION; SINGLE DIRAC CONE;

D O I：

10.1038/s41598-017-04985-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We present our angle resolved photoelectron spectroscopy (ARPES) and density functional theory results on quaternary topological insulator (TI) BiSbTe1.25Se1.75 (BSTS) confirming the non- trivial topology of the surface state bands (SSBs) in this compound. We find that the SSBs, which are are sensitive to the atomic composition of the terminating surface have a partial 3D character. Our detailed study of the band bending (BB) effects shows that in BSTS the Dirac point (DP) shifts by more than two times compared to that in Bi2Se3 to reach the saturation. The stronger BB in BSTS could be due to the difference in screening of the surface charges. From momentum density curves (MDCs) of the ARPES data we obtained an energy dispersion relation showing the warping strength of the Fermi surface in BSTS to be intermediate between those found in Bi2Se3 and Bi2Te3 and also to be tunable by controlling the ratio of chalcogen/pnictogen atoms. Our experiments also reveal that the nature of the BB effects are highly sensitive to the exposure of the fresh surface to various gas species. These findings have important implications in the tuning of DP in TIs for technological applications.

引用

页数：10

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