151 research outputs found
Nonlinear conductance of nanowires - A signature of Luttinger liquid effects?
We analyze recent measurements of the room temperature current-voltage
characteristics of gold nanowires, whose zero current conductance is quantized
in units of . A faster than linear increase of current with voltage was
observed at low voltages beginning from V. We analyze the nonlinear
behavior in terms of a dynamic Coulomb blockade of conducting modes and show
that it may be explained as a Luttinger-liquid effect.Comment: 13 pages, latex with supplied stylefile, 3 figures in eps format,
submitted to Superlattices and Microstructure
Influence of the Rashba effect on the Josephson current through a superconductor/Luttinger liquid/superconductor tunnel junction
The Josephson current through a 1D quantum wire with Rashba spin-orbit and
electron-electron interactions is calculated. We show that the interplay of
Rashba and Zeeman interactions gives rise to a supercurrent through the 1D
conductor that is anomalous in the sense that it persists in the absence of any
phase difference between the two superconducting leads to which it is attached.
The electron dispersion asymmetry induced by the Rashba interaction in a
Luttinger-liquid wire plays a significant role for poorly transmitting
junctions. It is shown that for a weak or moderate electron-electron
interaction the spectrum of plasmonic modes confined to the normal part of the
junction becomes quasi-random in the presence of dispersion asymmetry.Comment: 25 pages, 3 figure
Persistent current in a one-dimensional ring of fractionally charged "exclusons''
The Aharonov-Bohm effect in a one-dimensional (1D) ring containing a gas of
fractionally charged excitations is considered. It is shown that the low
temperature behavior of the system is identical to that of free electrons with
(integer) charge . This is a direct consequence of the fact that the total
charge in the ring is quantized in units of the electron charge. Anomalous
oscillations of the persistent current amplitude with temperature are predicted
to occur as a direct manifistation of the fractional nature of the
quasiparticle charge. A 1D conducting ring with gate induced periodical
potential is discussed as a possible set-up for an experimental observation of
the predicted phenomenon.Comment: 4 pages, RevTex, uuencoded figure
Shuttling of Spin Polarized Electrons in Molecular Transistors
Shuttling of electrons in single-molecule transistors with magnetic leads in
the presence of an external magnetic field is considered theoretically. For a
current of partially spin-polarized electrons a shuttle instability is
predicted to occur for a finite interval of external magnetic field strengths.
The lower critical magnetic field is determined by the degree of spin
polarization and it vanishes as the spin polarization approaches 100%. The
feasibility of detecting magnetic shuttling in a -based molecular
transistor with magnetic (Ni) electrodes is discussed [A.~N.~Pasupathy et al.,
Science 306, 86 (2004)].Comment: Submitted to a special issue of "Synthetic Metals" to appear in March
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