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

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

doi:10.1209/0295-5075/117/27006

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

Abstract

Here, 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.

Authors:

Zhao, J. ^[1]; Malliakas, C. D. ^[2]; Wijayaratne, K. ^[1]; Karlapati, V. ^[1]; Appathurai, N. ^[1]; Chung, D. Y. ^[3]; Rosenkranz, S. ^[3]; Kanatzidis, M. G. ^[2]; Chatterjee, U. ^[1]

Univ. of Virginia, Charlottesville, VA (United States)
Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Publication Date:: Fri Mar 10 00:00:00 EST 2017

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)

OSTI Identifier:: 1349520

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Europhysics Letters

Additional Journal Information:: Journal Volume: 117; Journal Issue: 2; Journal ID: ISSN 0295-5075

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


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

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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. Spectroscopic evidence for temperature-dependent convergence of light- and heavy-hole valence bands of PbQ (Q = Te, Se, S).  United States.  https://doi.org/10.1209/0295-5075/117/27006

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                    Zhao, J., Malliakas, C. D., Wijayaratne, K., Karlapati, V., Appathurai, N., Chung, D. Y., Rosenkranz, S., Kanatzidis, M. G., and Chatterjee, U. Fri .  
"Spectroscopic evidence for temperature-dependent convergence of light- and heavy-hole valence bands of PbQ (Q = Te, Se, S)".  United States.  https://doi.org/10.1209/0295-5075/117/27006.  https://www.osti.gov/servlets/purl/1349520.

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@article{osti_1349520,

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

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

  abstractNote = {Here, 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.},

  doi          = {10.1209/0295-5075/117/27006},

  journal      = {Europhysics Letters},

  number       = 2,

  volume       = 117,

  place        = {United States},

  year         = {Fri Mar 10 00:00:00 EST 2017},

  month        = {Fri Mar 10 00:00:00 EST 2017}

}

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Works referencing / citing this record:

Valleytronics in thermoelectric materials
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Title: Spectroscopic evidence for temperature-dependent convergence of light- and heavy-hole valence bands of PbQ (Q = Te, Se, S)

Abstract

Citation Formats

Valleytronics in thermoelectric materials journal, February 2018

Valleytronics in thermoelectric materials
journal, February 2018