Biomedical subjects

E G Mishchenko

Publications and source records attributed to E G Mishchenko.

6 recordsLinked to original sources

PubMed2005

Pseudospin ferromagnetism in double-quantum-wire systems.

We propose that a pseudospin ferromagnetic (i.e., interwire coherent) state can exist in a system of two parallel wires of finite width in the presence of a perpendicular magnetic field. This novel quantum many-body state appears when the interwire distance decreases below a certain critical value which depends on the magnetic field. We determine the phase boundary of the ferromagnetic phase by analyzing the softening of the spin-mode velocity using the bosonization approach. We also discuss the signatures of this state in tunneling and Coulomb drag experiments.

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PubMed2005

Breached superfluidity via p-wave coupling.

Anisotropic pairing between fermion species with different Fermi momenta opens two-dimensional areas of gapless excitations, thus producing a spatially homogeneous state with coexisting superfluid and normal fluids. This breached pairing state is stable and robust for arbitrarily small mismatch and weak p-wave coupling.

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PubMed2004

Spin current and polarization in impure two-dimensional electron systems with spin-orbit coupling.

We derive the transport equations for two-dimensional electron systems with Rashba spin-orbit interaction and short-range spin-independent disorder. In the limit of slow spatial variations, we obtain coupled diffusion equations for the electron density and spin. Using these equations we calculate electric-field induced spin accumulation and spin current in a finite-size sample for an arbitrary ratio between spin-orbit energy splitting Delta and elastic scattering rate tau(-1). We demonstrate that the spin-Hall conductivity vanishes in an infinite system independent of this ratio.

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PubMed2003

Coulomb drag by small momentum transfer between quantum wires.

We demonstrate that in a wide range of temperatures Coulomb drag between two weakly coupled quantum wires is dominated by processes with a small interwire momentum transfer. Such processes, not accounted for in the conventional Luttinger liquid theory, cause drag only because the electron dispersion relation is not linear. The corresponding contribution to the drag resistance scales with temperature as T2 if the wires are identical, and as T5 if the wires are different.

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PubMed2001

Zero-bias anomaly in disordered wires.

We calculate the low-energy tunneling density of states nu(epsilon,T) of an N-channel disordered wire, taking into account the electron-electron interaction nonperturbatively. The finite scattering rate 1/tau results in a crossover from the Luttinger liquid behavior at higher energies, nu proportional to epsilon(alpha), to the exponential dependence nu(epsilon,T = 0) proportional to exp(-epsilon*/epsilon) at low energies, where epsilon* proportional to 1/(Ntau). At finite temperature T, the tunneling density of states depends on the energy through the dimensionless variable epsilon/root square[epsilon*T]. At the Fermi level nu(epsilon = 0,T)proportional to exp(-root square[epsilon*/T]).

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PubMed2000

Nonlinear voltage dependence of the shot noise in mesoscopic degenerate conductors with strong electron-electron scattering.

It is shown that measurements of zero-frequency shot noise can provide information on electron-electron interaction, because the strong interaction results in the nonlinear voltage dependence of the shot noise in metallic wires. This is due to the fact that the Wiedemann-Franz law is no longer valid in the case of considerable electron-electron interaction. The deviations from this law increase the noise power and make it strongly dependent on the ratio of electron-electron and electron-impurity scattering rates.

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