1,721,185 research outputs found
Spin-orbit induced anisotropy in the magnetoconductance of two-dimensional metals
No full textSpin-orbit induced anisotropy in the magnetoconductance of two-dimensional metals / P. Schwab ... – In: Physical review. B. 64. 2001. 23511
Oral History Interview: Donald P. Schwab (686)
No full textAbstract: In his 2004 interview with W. Lee Hansen, Donald P. Schwab discusses his intellectual interests, his tenure at UW-Madison, and the courses he taught during his career. Much of the interview focuses on the Schwab?s role at Industrial Relations Resource Institute and the institution?s demise in the early 2000s
Coherent transport in disordered metals out of equilibrium
No full textWe derive a formula for the quantum corrections to the electrical current for
a metal out of equilibrium. In the limit of linear current-voltage characteristics
our formula reproduces the well known
Altshuler-Aronov correction to the conductivity of a disordered metal.
The current formula is obtained by a direct diagrammatic
approach, and is shown to agree with what is obtained within the Keldysh formulation
of the non-linear sigma model.
As an application we calculate the current of a mesoscopic wire.
We find a current-voltage characteristics that scales with eV/kT, and calculate
the different scaling curves for a wire in the hot-electron regime and in the
regime of full non-equilibrium
Magnetoconductance of a two-dimensional metal in the presence of spin-orbit coupling
No full textWe show that in the metallic phase of a two dimensional electron gas the
spin-orbit coupling due to structure inversion
asymmetry leads to a characteristic anisotropy in the magnetoconductance.
Within the assumption that the metallic phase can be described by a Fermi liquid,
we compute the conductivity in the presence of an in-plane magnetic field.
Both the spin-orbit coupling and the Zeeman coupling with the magnetic field
give rise to two spin subbands, in terms of which most of the transport
properties can be discussed.
The strongest conductivity anisotropy occurs for
Zeeman energies of the order of the Fermi energy corresponding to
the depopulation of the upper spin subband. The energy scale associated
with the spin-orbit coupling controls the strength of the effect.
More in particular, we find that the detailed behavior and
the sign of the anisotropy depends on the underlying
scattering mechanism.
Assuming small angle scattering to be the dominant scattering mechanism our
results agree with recent measurement on Si-MOSFET's
in the vicinity of the metal-insulator transition
Coherent transport in disordered metals: zero dimensional limit
No full textWe consider non-equilibrium transport in disordered conductors.
We calculate the interaction correction to the current for a short wire connected
to electron reservoirs by resistive interfaces.
In the absence of charging effects we find a universal current-voltage-characteristics.
The relevance of our calculation for existing experiments is discussed as well
as the connection with alternative theoretical approaches
Spesific heat anomaly and adiabatic hysteresis in disordered electron systems in a magnetic field
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