Blueshifted Flat Dispersion Relation of Exciton-Polariton Condensates in a CuBr Microcavity

被引：13

作者：

Nakayama, Masaaki ^{[1
]}

Murakami, Katsuya ^{[1
]}

Kim, DaeGwi ^{[1
]}

机构：

[1] Osaka City Univ, Grad Sch Engn, Dept Appl Phys, Osaka 5588585, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2016年 / 85卷 / 05期

关键词：

BOSE-EINSTEIN CONDENSATION;

D O I：

10.7566/JPSJ.85.054702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated cavity-polariton condensation effects on the dispersion relation of the lower polariton branch (LPB) at 77K in a CuBr microcavity by angle-resolved photoluminescence (PL) spectroscopy. The intrinsic cavity-polariton dispersion relations were characterized by the analysis of the incident light angle (in-plane wave vector k(parallel to)) dependence of cavity-polariton energies obtained using angle-resolved reflectance spectroscopy. It was found that a blueshifted PL band appears with a threshold-like nature as a function of excitation power density. The in-plane wave vector dependence of the blueshifted PL energy exhibits a flat dispersion relation in the k(parallel to) range from 0 to similar to 4.4 mu m(-1), which is clearly separated from the intrinsic LPB because of the large blueshift of similar to 15 meV. We show that the blueshifted flat dispersion relation is possibly explained by the theory for a diffusive Goldstone mode peculiar to nonequilibrium cavity-polariton condensation.

引用

页数：7

共 38 条

[31] Strong coupling phenomena in quantum microcavity structures [J].

Skolnick, MS ;

Fisher, TA ;

Whittaker, DM .

SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 1998, 13 (07) :645-669

[32] K-LINEAR-TERM AND POLARITON EFFECTS ON Z1,2 EXCITIONS IN CUBR [J].

SUGA, S ;

CHO, K ;

BETTINI, M .

PHYSICAL REVIEW B, 1976, 13 (02) :943-945

[33]

Svelto O, 2010, PRINCIPLES OF LASERS, FIFTH EDITION, P163, DOI 10.1007/978-1-4419-1302-9_5

[34] Relaxation bottleneck and its suppression in semiconductor microcavities [J].

Tartakovskii, AI ;

Emam-Ismail, M ;

Stevenson, RM ;

Skolnick, MS ;

Astratov, VN ;

Whittaker, DM ;

Baumberg, JJ ;

Roberts, JS .

PHYSICAL REVIEW B, 2000, 62 (04) :R2283-R2286

[35] PICOSECOND SPECTROSCOPY OF EXCITONIC MOLECULES IN CUBR [J].

UNUMA, Y ;

MASUMOTO, Y ;

SHIONOYA, S .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1982, 51 (04) :1200-1206

[36] Observation of Bogoliubov excitations in exciton-polariton condensates [J].

Utsunomiya, S. ;

Tian, L. ;

Roumpos, G. ;

Lai, C. W. ;

Kumada, N. ;

Fujisawa, T. ;

Kuwata-Gonokami, M. ;

Loeffler, A. ;

Hoefling, S. ;

Forchel, A. ;

Yamamoto, Y. .

NATURE PHYSICS, 2008, 4 (09) :700-705

[37] Spatial and spectral shape of inhomogeneous nonequilibrium exciton-polariton condensates [J].

Wouters, Michiel ;

Carusotto, Iacopo ;

Ciuti, Cristiano .

PHYSICAL REVIEW B, 2008, 77 (11)

[38] Excitations in a nonequilibrium Bose-Einstein condensate of exciton polaritons [J].

Wouters, Michiel ;

Carusotto, Iacopo .

PHYSICAL REVIEW LETTERS, 2007, 99 (14)

← 1 2 3 4 →