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arxiv: 1111.6284 · v1 · pith:IMKYU2FNnew · submitted 2011-11-27 · ❄️ cond-mat.mtrl-sci · cond-mat.other

Raman signatures of pressure induced electronic topological and structural transitions in Bi2Te3

Gopal K. Pradhan , Achintya Bera , Pradeep Kumar , D. V. S. Muthu , A. K. Sood This is my paper
classification ❄️ cond-mat.mtrl-sci cond-mat.other
keywords bi2te3modepressureramanstructuraltransitionalphabeta
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We report Raman signatures of electronic topological transition (ETT) at 3.6 GPa and rhombohedral ({\alpha}-Bi2Te3) to monoclinic ({\beta}-Bi2Te3) structural transition at ~ 8 GPa. At the onset of ETT, a new Raman mode appears near 107 cm-1 which is dispersionless with pressure. The structural transition at ~ 8 GPa is marked by a change in pressure derivative of A1g and Eg mode frequencies as well as by appearance of new modes near 115 cm-1and 135 cm-1. The mode Gr\"uneisen parameters are determined in both the {\alpha} and {\beta}-phases.

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