Resonant phonon scattering of paraexcitons in Cu2O

被引：8

作者：

Sandfort, Christian ^{[1
]}

Brandt, Jan ^{[1
]}

Froehlich, Dietmar ^{[1
]}

Bayer, Manfred ^{[1
]}

Stolz, Heinrich ^{[2
]}

机构：

[1] Tech Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany

[2] Univ Rostock, Fachbereich Phys, D-18501 Rostock, Germany

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.78.045201

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The paraexciton in Cu(2)O is optically forbidden to all orders. By means of a magnetic field, it obtains oscillator strength from the quadrupole allowed orthoexciton. With an external magnetic field, we are able to excite resonantly ultracold paraexcitons. We observe a pronounced resonant Raman signal on top of the luminescence from thermalized paraexcitons. We present the magnetic-field dependence of the Gamma(-)(3) phonon replica of the paraexciton. In addition, we show the spectra of the Gamma(-)(2), Gamma(-)(4), and Gamma(-)(5) phonon sidebands. We are even able to observe two-phonon scattering of the paraexciton.

引用

页数：5

共 17 条

[1] Ultranarrow optical absorption and two-phonon excitation spectroscopy of Cu2O paraexcitons in a high magnetic field [J].

Brandt, Jan ;

Froehlich, Dietmar ;

Sandfort, Christian ;

Bayer, Manfred ;

Stolz, Heinrich ;

Naka, Nobuko .

PHYSICAL REVIEW LETTERS, 2007, 99 (21)

[2] Wave-vector-dependent exchange interaction and its relevance for the effective exciton mass in Cu2O -: art. no. 045206 [J].

Dasbach, G ;

Fröhlich, D ;

Klieber, R ;

Suter, D ;

Bayer, M ;

Stolz, H .

PHYSICAL REVIEW B, 2004, 70 (04) :045206-1

[3] Wave nector-dependent exciton exchange interaction -: art. no. 107401 [J].

Dasbach, G ;

Fröhlich, D ;

Stolz, H ;

Klieber, R ;

Suter, D ;

Bayer, M .

PHYSICAL REVIEW LETTERS, 2003, 91 (10)

[4] High resolution spectroscopy of excitons in Cu2O [J].

Froehlich, D. ;

Brandt, J. ;

Sandfort, C. ;

Bayer, M. ;

Stolz, H. .

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 2006, 243 (10) :2367-2374

[5] High resolution spectroscopy of yellow 1S excitons in Cu2O [J].

Fröhlich, D ;

Dasbach, G ;

von Högersthal, GBH ;

Bayer, M ;

Klieber, R ;

Suter, D ;

Stolz, H .

SOLID STATE COMMUNICATIONS, 2005, 134 (1-2) :139-142

[6] QUADRUPOLE-DIPOLE RAMAN-SCATTERING AT 1S YELLOW EXCITON IN CU2O [J].

GENACK, AZ ;

CUMMINS, HZ ;

WASHINGTON, MA ;

COMPAAN, A .

PHYSICAL REVIEW B, 1975, 12 (06) :2478-2487

[7] EVIDENCE FOR BOSE-EINSTEIN STATISTICS IN AN EXCITON GAS [J].

HULIN, D ;

MYSYROWICZ, A ;

BENOITALAGUILLAUME, C .

PHYSICAL REVIEW LETTERS, 1980, 45 (24) :1970-1973

[8] Spin-exchange kinetics of excitons in Cu2O:: Transverse acoustic phonon mechanism -: art. no. 195205 [J].

Jang, JI ;

O'Hara, KE ;

Wolfe, JP .

PHYSICAL REVIEW B, 2004, 70 (19) :1-8

[9]

Koster G. F., 1963, PROPERTIES 32 POINT

[10] OPTICAL-ABSORPTION DUE TO PARAEXCITON OF CU2O [J].

KUWABARA, G ;

TANAKA, M ;

FUKUTANI, H .

SOLID STATE COMMUNICATIONS, 1977, 21 (06) :599-601

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