Conductance of a disordered double quantum wire in a magnetic field: Boundary roughness scattering

• Boundary roughness scattering in disordered tunnel-coupled quantum wires in the presence of a magneticfield is considered. The low-temperature conductance as a function of applied magnetic field is calculated fordifferent structure and disorder parameters using the method of the generalized S-matrix composition.We showthat despite the fact that lateral wire width fluctuations of the size of few atomic layers may significantly shiftthe partial energy gap, the effect of the conductance enhancement at energies in the partial energy gap doestake place in sufficiently strong magnetic fields and small correlation length of the disorder defined as theaverage distance between the neighboring discontinuities of the boundary profile. The last parameter is shownto be particularly important for the determination of the transport properties of the system. Remarkably, we findthat in a wide range of system parameters the conductance decreases with the correlation length despite thedecreasing number of boundary discontinuities.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

Mesoscopic physics

Mesoskopisk fysik

electron-scattering

Publication and Content Type

ref (subject category)

art (subject category)