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Observation of a Smoothly Tunable Dirac Point in Ge(Bi_(x)Sb_(1-x))₂Te₄

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arxiv 2101.05166 v3 pith:LWN7GLOK submitted 2021-01-13 cond-mat.mtrl-sci cond-mat.mes-hall

Observation of a Smoothly Tunable Dirac Point in Ge(Bi_(x)Sb_(1-x))₂Te₄

classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords topologicaldiracpointtunablecrossingobservationsmoothlyspectroscopy
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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, $Ge(Bi_{x}Sb_{1-x})_{2}Te_{4}$, 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.

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