Search
Now showing items 31-40 of 45
Anomalous Hall effect in a two-dimensional electron gas
(American Physical Society, 2007)
The anomalous Hall effect in a magnetic two-dimensional electron gas with Rashba spin-orbit coupling is studied within the Kubo-Streda formalism in the presence of pointlike potential impurities. We find that all contributions ...
Fast quantum noise in the Landau-Zener transition
(American Physical Society, 2007)
We show by direct calculation starting from a microscopic model that the two-state system with time-dependent energy levels in the presence of fast quantum noise obeys the master equation. The solution of master equation ...
Chirping a two-photon transition in a multistate ladder RID C-2713-2008 RID A-7617-2010
(American Physical Society, 2007)
We consider a two-photon transition in a specific ladder system driven by a chirped laser pulse. In the weak field limit, we find that the excited state probability amplitude arises due to interference of multiple quantum ...
Role of noise operators on two-photon correlations in an extended coherent Raman medium
(American Physical Society, 2007)
An extended medium driven in a double Raman configuration generates Stokes and anti-Stokes fields that are described by coupled parametric oscillator equations with solutions that depend on input boundary operators and ...
Vacuum energy and repulsive Casimir forces in quantum star graphs
(American Physical Society, 2007)
Casimir pistons are models in which finite Casimir forces can be calculated without any suspect renormalizations. It has been suggested that such forces are always attractive, but we present several counterexamples, notably ...
Functional Keldysh theory of spin torques
(American Physical Society, 2007)
We present a microscopic treatment of current-induced torques and thermal fluctuations in itinerant ferromagnets based on a functional formulation of the Keldysh formalism. We find that the nonequilibrium magnetization ...
Torque magnetometry study of metamagnetic transitions in single-crystal HoNi(2)B(2)C at T approximate to 1.9 K
(American Physical Society, 2007)
Metamagnetic transitions in single-crystal rare-earth nickel borocarbide HoNi(2)B(2)C have been studied at T approximate to 1.9 K with a Quantum Design torque magnetometer. This compound is highly anisotropic with a variety ...
Superconductivity in gallium-substituted Ba8Si46 clathrates
(American Physical Society, 2007)
We report a joint experimental and theoretical investigation of superconductivity in Ga-substituted type-I silicon clathrates. We prepared samples of the general formula Ba8Si46-xGax, with different values of x. We show ...
Laser-excited acoustic oscillations in silver and bismuth nanowires
(American Physical Society, 2007)
Coherent acoustic oscillations in Bi and Ag nanowire samples were studied with a femtosecond pump-probe technique and detection of the scattered light. The observed optical and acoustic properties reflect the nanostructure ...