Fast-particle energy loss to a layered electron gas

Journal Article · Wed Jun 15 00:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.10184· OSTI ID:5122085

Gumbs, G

The energy loss of a fast-charged-particle probe of an array of parallel two-dimensional (2D) electron-gas layers is calculated. The two-dimensional electron-gas (2D EG) layers are equally spaced and are used to model modulation-doped semiconductor superlattices such as GaAs-(Al/sub x/Ga/sub 1/..sqrt../sub x/)As in the electric quantum limit where only the lowest subband is occupied. The 2D EG layers of the model system are embedded in a slab with background dielectric constant epsilon, with vacuum on one side and a material with background dielectric constant epsilon/sub 0/ on the other. The dielectric materials screen the Coulomb interaction between electrons which are confined to the 2D planes. The fast-particle motion is taken to be parallel to the 2D plasma layers which are assumed to be at zero temperature. The electronic response dynamics are described in the random-phase approximation. The energy loss is determined as a function of the distance of the fast particle from the surface of the superlattice and its velocity.

• Research Organization: Department of Physics, University of Lethbridge, Lethbridge, Alberta, Canada T1K 3M4
• OSTI ID: 5122085
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 37:17
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED PARTICLES
ENERGY LOSSES
ELECTRON GAS
LAYERS
PROBES
RANDOM PHASE APPROXIMATION
SEMICONDUCTOR MATERIALS
SIMULATION
SUPERLATTICES
TRAJECTORIES
FLUIDS
GASES
LOSSES
MATERIALS
654001* - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments