Thermally activated heavy states and anomalous optical properties in a multiband metal: The case of SrMnSb2

Cited 6 time in webofscience Cited 0 time in scopus
214 Viewed 53 Downloaded
Title
Thermally activated heavy states and anomalous optical properties in a multiband metal: The case of SrMnSb2
Author(s)
Hyun Ju Park; Luke J. Sandilands; Jungsang You; Hyo Seak Ji; Chang Hee Sohn; Jeongwoo Han; Soon Jae Moon; Kyung Wan Kim; Jihoon Shim; Junsung Kim; Taewon Noh
Publication Date
2016-05
Journal
PHYSICAL REVIEW B, v.93, no.20, pp.205122 -
Publisher
AMER PHYSICAL SOC
Abstract
We report an optical spectroscopic study of SrMnSb2, a low-carrier-density metal. As temperature is decreased, our measurements reveal a large increase in the quasiparticle plasma frequency, which is highly unusual for a metal. This seemingly anomalous behavior can be accounted for using a "three-band" model of the multiband electronic structure of SrMnSb2 that includes two conduction bands and one valence band. The second conduction band is assumed to be heavy and its minimum is taken to be close to, but not intersecting, the Fermi level. At finite temperature, quasiparticles are thermally redistributed between the two conduction bands, leading to an increase in the optical effective mass and a decrease in the plasma frequency. The temperature dependence of the low-lying interband optical transitions and the Hall number can also be understood using our model. The phenomenology of such a three-band scenario has not been widely considered to date in optical spectroscopic studies. Our results provide an explanation for the puzzling optical properties that have previously been reported in a number of topical low-carrier-density metals and semimetals and lay a foundation for future optical studies of these materials
URI
https://pr.ibs.re.kr/handle/8788114/2674
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
Thermally activated heavy.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse