Excitonic versus electron-hole liquid phases in Tm[Se,Te] compounds

被引：8

作者：

Bronold, Franz X. ^{[1
]}

Fehske, Holger ^{[1
]}

Roepke, Gerd ^{[2
]}

机构：

[1] Ernst Moritz Arndt Univ Greifswald, Inst Phys, D-17489 Greifswald, Germany

[2] Univ Rostock, Fachbereich Phys, D-18051 Rostock, Germany

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2007年 / 76卷

关键词：

semiconductor-semimetal transition; electron-hole liquids; exciton condensation;

D O I：

10.1143/JPSJS.76SA.27

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We discuss, from a theoretical point of view, excitonic phases at the pressure induced semiconductor-semimetal transition in TmSe0.45Te0.55, focusing, in particular, on the stability against an electron-hole liquid. The electron-hole pair density parameter r(s)(E-g,T) is calculated within the quasi-static plasmon pole approximation as a function of temperature T and energy gap E-g and converted into -E-g(r(s),T). A comparison of this quantity, which is the electron-hole pair chemical potential, with the exciton binding energy reveals that excitons should be suppressed in contrast to experimental evidence for excitonic phases. We suspect therefore inter-valley exciton scattering and exciton-phonon scattering to substantially stabilise excitons in TmSe0.45Te0.55.

引用

页码：27 / 30

页数：4

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