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 language | English |
|---|---|
| Article number | 27006 |
| Journal | EPL |
| Volume | 117 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jan 1 2017 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
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, Mercouri G; Chatterjee, U.
In: EPL, Vol. 117, No. 2, 27006, 01.01.2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Spectroscopic evidence for temperature-dependent convergence of light- and heavy-hole valence bands of PbQ (Q = Te, Se, S)
AU - Zhao, J.
AU - Malliakas, C. D.
AU - Wijayaratne, K.
AU - Karlapati, V.
AU - Appathurai, N.
AU - Chung, D. Y.
AU - Rosenkranz, S.
AU - Kanatzidis, Mercouri G
AU - Chatterjee, U.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85015787756&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85015787756&partnerID=8YFLogxK
U2 - 10.1209/0295-5075/117/27006
DO - 10.1209/0295-5075/117/27006
M3 - Article
VL - 117
JO - Europhysics Letters
JF - Europhysics Letters
SN - 0295-5075
IS - 2
M1 - 27006
ER -