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政大典藏 > College of Science > Graduate Institute of Applied Physics > Periodical Articles > Item 140.119/120828

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Title:	Anti-site defect effect on the electronic structure of a Bi2Te3 topological insulator
Authors:	Chuang, PY;Su, SH;Chong, CW;Chen, YF;Chou, YH;Huang, JCA;Chen, WC;Cheng, CM;Tsuei, KD;Wang, CH;Yang, YW;Liao, YF;Weng, SC;Lee, JF;Lan, YK;Chang, SL;Lee, CH;Yang, CK;Su, HL;Wu, YC 楊志開 Yang, Chih-Kai
Contributors:	應物所
Date:	2018
Issue Date:	2018-11-06 14:55:14 (UTC+8)
Abstract:	Tuning the Fermi level (EF) in Bi2Te3 topological-insulator (TI) films is demonstrated on controlling the temperature of growth with molecular-beam epitaxy (MBE). Angle-resolved photoemission spectra (ARPES) reveal that EF of Bi2Te3 thin films shifts systematically with the growth temperature (Tg). The key role that a Bi-on-Te(1) (BiTe1) antisite defect plays in the electronic structure is identified through extended X-ray-absorption fine-structure (EXAFS) spectra at the Bi L-3-edge. Calculations of electronic structure support the results of fitting the EXAFS, indicating that the variation of EF is due to the formation and suppression of BiTe1 that is tunable with the growth temperature. Our findings provide not only insight into the correlation between the defect structure and electronic properties but also a simple route to control the intrinsic topological surface states, which could be useful for applications in TIbased advanced electronic and spintronic devices.
Relation:	RSC ADVANCES, 8(1), 423-428
Data Type:	article
DOI link:	http://dx.doi.org/10.1039/c7ra08995c
DOI:	10.1039/c7ra08995c
Appears in Collections:	[Graduate Institute of Applied Physics] Periodical Articles

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