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Raman-scattering and optical studies of argon-etched GaAs surfaces
(American Physical Society, 1991-04)
We have studied the structual damage in low-energy argon-ion-bombarded (ion-etched) GaAs using Raman scattering and ultraviolet reflectivity. When combined with post-bombardment sequential chemical etching, the Raman results ...
t-J model studied by the power Lanczos method
(American Physical Society, 1995-03)
The initial trial wave function used in a simple ground-state projection method, the power method, is systematically improved by using Lanczos algorithm. Much faster convergence to the ground state achieved by using these ...
Resonant Raman-active acoustic phonons in ion-implanted GaAs
(American Physical Society, 1988-09)
We have observed a new, strong feature at 47 cm-1 in the first-order Raman spectrum of ion-implanted GaAs, prior to any anneal. It is not present in the Raman spectrum of either amorphous or single-crystal GaAs. The peak ...
Semiclassical interpretation of the spin interference effect observed in square loop arrays of In0.53Ga0.47As/In0.52Al0.48As quantum wells
(American Physical Society, 2011-12)
We present a semiclassical interpretation of the time-reversal spin interference (SI) observed in the square loop arrays made of In0.53Ga0.47As quantum wells [T. Koga et al., Phys. Rev. B 74, 041302 (2006)]. The simulated ...
Effects of translational symmetry breaking induced by the boundaries in a driven diffusive system
(American Physical Society, 1991-04)
We study the effects of the boundary conditions in a driven diffusive lattice-gas model which is known to display kinetic phase transitions. We find, in the case of attractive interaction, that a boundary-condition-induced ...
Spectral momentum density of graphite from (e,2e) spectroscopy: Comparison with first-principles calculation
(American Physical Society, 1988-03)
We have measured the spectral momentum density ρ(E,q) of graphite by (e,2e) spectroscopy for momentum parallel and perpendicular to the crystal c axis. In the independent-electron approximation, ρ(E,q)=ΣG‖Uk(G)‖2 ...
Dynamic nuclear polarization with an inhomogeneously broadened ESR line. II. Experiment
(American Physical Society, 1976-05)
Results of proton dynamic nuclear polarization (DNP), nuclear spin-lattice relaxation, and ESR experiments in six YES: Er168 (Er168-doped yttrium ethyl sulphate) single crystals at 4.15 K and 9.1 GHz are reported here. ...
1/N expansion for the degenerate Anderson model in the mixed-valence regime
(American Physical Society, 1983-07)
The 1N expansion method for the degenerate Anderson model is formulated. N is the degeneracy factor of one of the f-electron configurations. Various ground-state properties are calculated. Excellent agreement with the ...
Bistability in an Ising model with non-Hamiltonian dynamics
(American Physical Society, 1992-03)
We investigate the phenomenon of magnetization bistability in a two-dimensional Ising model with a non-Hamiltonian Glauber dynamics by means of Monte Carlo simulations. This effect has previously been observed in the Toom ...
Optical excitations in Bi2Sr2CuO6 and Bi2Sr2CaCu2O8: Evidence for localized (excitonic) and delocalized charge-transfer gaps
(American Physical Society, 1991-01)
The optical properties of Bi2Sr2CuO6 (2:2:0:1) and Bi2Sr2CaCu2O8 (2:2:1:2) have been investigated by transmission electron-energy-loss spectroscopy. At low energy, E(loss) less-than-or-equal-to 10.0 eV, common features are ...