Observation of a Smoothly Tunable Dirac Point in Ge(BixSb1-x)2Te4

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APS March Meeting 2022

Volume 67, Number 3

Monday–Friday, March 14–18, 2022; Chicago

Session S59: Transport, Probes, and Structure of Topological Insulators and Topological Crystalline Insulators

8:00 AM–11:00 AM, Thursday, March 17, 2022
Room: Hyatt Regency Hotel -DuSable AB

Sponsoring Unit: DCMP
Chair: Dipanjan Chaudhuri, University of Illinois at Urbana-Champai

Abstract: S59.00009 : Observation of a Smoothly Tunable Dirac Point in Ge(Bi_xSb_1-x)₂Te₄*

9:36 AM–9:48 AM

Abstract

Presenter:

Arjun Raghavan
(University of Illinois at Urbana-Champaign)

Authors:

Arjun Raghavan
(University of Illinois at Urbana-Champaign)

Sean T Howard
(University of Illinois at Urbana-Champaign)

Arjun Raghavan
(University of Illinois at Urbana-Champaign)

Davide Iaia
(University of Illinois at Urbana-Champaign)

Caizhi Xu
(University of Illinois at Urbana-Champaign)

David Flototto
(University of Illinois at Urbana-Champaign)

Man-Hong Wong
(University of Illinois at Urbana-Champaign)

Sung-Kwan Mo
(Lawrence Berkeley National Laboratory)

Bahadur Singh
(Tata Institute of Fundamental Research)

Raman Sankar
(Institute of Physics, Academia Sinica)

Hsin Lin
(Academia Sinica)

Tai-Chang Chiang
(University of Illinois at Urbana-Champaign)

Vidya Madhavan
(University of Illinois at Urbana-Champaign)

Next-generation topological devices use topologically protected surface states to drive electronic transport. In this study, we examine Ge(Bi_xSb_1-x)₂Te₄, a tunable topological system, for a range of x values from 0 to 1 using a combination of Fourier-Transform Scanning Tunneling Spectroscopy (FT-STS) and Angle-Resolved Photoemission Spectroscopy (ARPES). We show that the Dirac point changes linearly with x, crossing the Fermi energy at x = 0.7. This novel observation of a smoothly tunable, isolated Dirac point traversing the topological transport regime and having strong linear dependence with substitution can be critical in designing new topological spintronics applications.

*The STM work was supported by a grant from the U.S. Department of Energy (DOE), Office of Science (OS), Office of Basic Energy Sciences, under award No. DE-SC0014335. We acknowledge partial support from the Gordon and Betty Moore Foundation's EPiQS Initiative through grant GBMF4860. This work was carried out, in part, at the Seitz Materials Research Laboratory Central Research Facilities, at the University of Illinois at Urbana-Champaign. The ARPES work is supported by the U.S. Department of Energy (DOE), Office of Science (OS), Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Grant No. DE-FG02-07ER46383. This ARPES research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract No. DE-AC02-05CH11231. In addition, we acknowledge support from the Taiwan Ministry of Science and Technology (MOST), under Grant No. 109-2112-M-001-014-MY3 and Grant No. MOST-108-2112-M-001-049-MY2.

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Bulletin of the American Physical Society

APS March Meeting 2022

Volume 67, Number 3

Monday–Friday, March 14–18, 2022; Chicago

Session S59: Transport, Probes, and Structure of Topological Insulators and Topological Crystalline Insulators

Abstract: S59.00009 : Observation of a Smoothly Tunable Dirac Point in Ge(BixSb1-x)2Te4*

Presenter:

Authors:

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Abstract: S59.00009 : Observation of a Smoothly Tunable Dirac Point in Ge(Bi_xSb_1-x)₂Te₄*