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arXiv · 2110.06587

Electron-Phonon Coupling and Quantum Correction to Topological Magnetoconductivity in Bi2GeTe4

Niraj Kumar Singh·Divya Rawat·Dibyendu Dey·Anna Elsukova·Per O. Å. Persson·Per Eklund·A. Taraphder·Ajay Soni
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Abstract

We report on structure, vibrational properties and weak-antilocalization-(WAL-) induced quantum correction to magnetoconductivity in single crystal Bi2GeTe4. Surface band structure calculations show a single Dirac cone corresponding to topological surface states in Bi2GeTe4. An estimated phase coherence length, l_{\phi} ~ 143 nm and prefactor {\alpha} ~ - 1.54 from Hikami-Larkin-Nagaoka fitting of magnetoconductivity describe the quantum correction to conductivity. An anomalous temperature dependence of A1g Raman modes confirms enhanced electron-phonon interactions. Our results establish the involvement of vibrations of Bi-Te with existence of topological surface states and WAL in Bi2GeTe4.

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Niraj Kumar Singh, Divya Rawat, Dibyendu Dey, Anna Elsukova, Per O. Å. Persson, Per Eklund, A. Taraphder, Ajay Soni. 2021-10-13. Electron-Phonon Coupling and Quantum Correction to Topological Magnetoconductivity in Bi2GeTe4. https://doi.org/10.1103/physrevb.105.045134

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