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Paper detail

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

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_ϕ ~ 143 nm and prefactor α ~ - 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.

preprint2021arXivOpen access
Niraj Kumar SinghDivya RawatDibyendu DeyAnna ElsukovaPer O. Å. PerssonPer EklundA. TaraphderAjay Soni
cond-mat.mtrl-sci
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Niraj Kumar SinghDivya RawatDibyendu DeyAnna ElsukovaPer O. Å. PerssonPer EklundA. TaraphderAjay Soni

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