Observation of roton density of states in two-dimensional Landau-level excitations

Journal Article · Mon Dec 05 04:00:00 EST 1988 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.61.2701· OSTI ID:6933383

Pinczuk, A; Valladares, J P; Heiman, D; Gossard, A C; English, J H; Tu, C W; Pfeiffer, L; West, K

Inelastic light scattering by inter-Landau-level excitations of the 2D electron gas in high-mobility GaAs structures in a perpendicular magnetic field was observed at the energies of the critical points in the mode dispersions. For Landau-level filling factors /nu//ge/, structure in the spectra indicates the excitonic binding and roton behavior predicted by the Hartree-Fock approximation. The large critical-point wave vectors, qapprox. >((h/2/pi/)c/eB)/sup -1/2/approx. >10/sup 6/ cm/sup -1/, are probably accessible in resonant light scattering through the residual disorder that broadens the Landau levels.

• Research Organization: ATandT Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 6933383
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 61:23; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
ARGON IONS
ATOM TRANSPORT
AUGER ELECTRON SPECTROSCOPY
CATIONS
CHARGED PARTICLES
DIFFUSION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY RANGE
HEAT TREATMENTS
HIGH TEMPERATURE
INHIBITION
INTERFACES
IONS
KEV RANGE
KEV RANGE 01-10
LAYERS
MEDIUM TEMPERATURE
METALS
NEUTRAL-PARTICLE TRANSPORT
NICKEL
RADIATION TRANSPORT
SEMIMETALS
SILICON
SILVER
SORPTIVE PROPERTIES
SPECTROSCOPY
SPUTTERING
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS