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Optical investigation of the thermoelectric topological crystalline insulator Pb 0.77 Sn 0.23 Se

Author(s): Reijnders, Anjan A.; Hamilton, Jason; Britto, Vivian; Brubach, Jean-Blaise; Roy, Pascale; et al

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Abstract: Pb0.77Sn0.23Se is a promising thermoelectric alloy that exhibits a temperature dependent band inversion below 300 K. Recent work has shown that this band inversion also coincides with a trivial to nontrivial topological phase transition. To understand how the properties critical to thermoelectric efficiency are affected by the band inversion, we measured the broadband optical response of Pb0.77Sn0.23Se as a function of temperature. We find clear optical signatures suggesting the band inversion occurs at 160±15 K, and use the extended Drude model to accurately determine a T3/2 dependence of the bulk carrier lifetime, associated with electron-acoustic phonon scattering. Due to the high bulk carrier doping level, no discriminating signatures of the topological surface states are found, although their presence cannot be excluded from our data. © 2014 American Physical Society.
Publication Date: Dec-2014
Electronic Publication Date: 23-Dec-2014
Citation: Reijnders, Anjan A., Hamilton, Jason, Britto, Vivian, Brubach, Jean-Blaise, Roy, Pascale, Gibson, Quinn D., Cava, R.J., Burch, K.S. (2014). Optical investigation of the thermoelectric topological crystalline insulator. Physical Review B, 90 (23), 10.1103/PhysRevB.90.235144
DOI: doi:10.1103/PhysRevB.90.235144
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 90.23:235144-1 - 235144-9
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 90, Issue 23, 23 December 2014, Article number 235144.

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