Observation of a Smoothly Tunable Dirac Point in $Ge(B{i}_{x}S{b}_{1-x}{)}_{2}T{e}_4$

Abstract

State-of-the-art topological devices require the use topological surface states to drive electronic transport. In this study, we examine a tunable topological system, $Ge(B{i}_{x}S{b}_{1-x}{)}_{2}T{e}_4$, 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). Our results show that the Dirac point shifts linearly with 'x', crossing the Fermi energy near x = 0.7. This novel observation of a smoothly tunable, isolated Dirac point crossing through the topological transport regime and having strong linear dependence with substitution can be critical for future topological spintronics applications.

18 Pages, 9 Figures, including Appendix