Spectroscopic evidence for temperature-dependent convergence of light- and heavy-hole valence bands of PbQ (Q = Te, Se, S)

J. Zhao, C. D. Malliakas, K. Wijayaratne, V. Karlapati, N. Appathurai, D. Y. Chung, S. Rosenkranz, M. G. Kanatzidis, U. Chatterjee

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Abstract

We have conducted a temperature-dependent angle-resolved photoemission spectroscopy (ARPES) study of the electronic structures of PbTe, PbSe and PbS. Our ARPES data provide direct evidence for the light-hole upper valence bands (UVBs) and hitherto undetected heavy-hole lower valence bands (LVBs) in these materials. An unusual temperature-dependent relative movement between these bands leads to a monotonic decrease in the energy separation between their maxima with increasing temperature, which is known as band convergence and has long been believed to be the driving factor behind extraordinary thermoelectric performances of these compounds at elevated temperatures.

Original languageEnglish
Article number27006
JournalEPL
Volume117
Issue number2
DOIs
Publication statusPublished - Jan 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Zhao, J., Malliakas, C. D., Wijayaratne, K., Karlapati, V., Appathurai, N., Chung, D. Y., Rosenkranz, S., Kanatzidis, M. G., & Chatterjee, U. (2017). Spectroscopic evidence for temperature-dependent convergence of light- and heavy-hole valence bands of PbQ (Q = Te, Se, S). EPL, 117(2), [27006]. https://doi.org/10.1209/0295-5075/117/27006