Strain-confined electron-hole liquid in Ge: Density variations and compressibility

Journal Article · Thu Jul 15 04:00:00 EDT 1982 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.26.591· OSTI ID:7045349

Kelso, S M

We present a detailed theoretical and experimental investigation of a spatial variation in the electron-hole--pair density in the strain-confined electron-hole liquid in Ge. The density variation can be dramatic: We observed a compression of the central density by a factor of 3 for our largest drop radius, Rroughly-equal0.7 mm. Our experimental density profiles, obtained using Abel transforms of spatial luminescence profiles, are in good agreement with the theoretical predictions of approximately parabolic profiles with densities larger than the equilibrium value at the center of the drop. Our previous first-order theory has been extended to include the full density dependence of the pair free energy at finite stress and temperature. We discuss the shape and power dependence of spatial luminescence profiles and luminescence spectra, since the spatial density variation increases with drop size. We use the central densities for drop sizes ranging over an order of magnitude to measure the density dependence of the electron-hole--liquid chemical potential, providing a sensitive test of many-body theories for the correlation energy. We obtain an improved value for the isothermal compressibility of the strain-confined liquid: K/sub T/ = 0.067 +- 0.017 cm/sup 2//dyn for n = 0.47 x 10/sup 17/ cm/sup -3/, T = 1.9 K, and -sigma = 5.5 kgf/mm/sup 2/, where kgf represents kilogram force.

• Research Organization: Physics Department, University of California, Berkeley, California 94720 and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
• OSTI ID: 7045349
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 26:2; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656001 -- Condensed Matter Physics-- Solid-State Plasma
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPRESSIBILITY
DATA
DENSITY
DISTRIBUTION
ELECTRON-HOLE DROPLETS
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FREE ENERGY
GERMANIUM
INFORMATION
LUMINESCENCE
MECHANICAL PROPERTIES
METALS
NUMERICAL DATA
PHYSICAL PROPERTIES
PLASMA
SOLID-STATE PLASMA
SPATIAL DISTRIBUTION
THERMODYNAMIC PROPERTIES