Optical dielectric function for highly excited semiconductors in the moment-conserving approximation

Journal Article · Tue Dec 15 04:00:00 EST 1981 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.24.7304· OSTI ID:5875670

Singh, H B; Schmitt-Rink, S; Haug, H

We have calculated the complex optical dielectric function of an electron-hole plasma in highly excited direct-gap semiconductors using the double-time Green's-function method. The equation of motion for an appropriate Green's function is linearized in the moment-conserving and Hartree-Fock approximations. Their interrelationship and the connection with earlier treatments of the electron-hole correlation is discussed. The electron-hole correlation yields an enhancement of the free-particle response and reproduces the overall shape of the observed gain and absorption spectra satisfactorily. The calculated changes in the refraction index with varying excitation energy exhibit a strong dispersive nonlinearity which explains the occurrence of optical bistability.

• Research Organization: Institut fuer Theoretische Physik der Universitaet Frankfurt, Robert-Mayer-Strasse 8, D-6000 Frankfurt-Main, Federal Republic of Germany
• OSTI ID: 5875670
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 24:12; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656001* -- Condensed Matter Physics-- Solid-State Plasma
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
AMPLIFICATION
CORRELATION FUNCTIONS
FUNCTIONS
GAIN
GREEN FUNCTION
HARTREE-FOCK METHOD
MATERIALS
OPTICAL DISPERSION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
REFRACTIVITY
SEMICONDUCTOR MATERIALS
SOLID-STATE PLASMA
SPECTRA