7,681 research outputs found
Impurity pinning in transport through 1D Mott-Hubbard and spin gap insulators
A low energy crossover (see cond-mat/9711167) induced by Fermi liquid
reservoirs in transport through a 1D Mott-Hubbard insulator of finite length
is examined in the presence of impurity pinning. Under the assumption that
the Hubbard gap 2M is large enough: (: charge
velocity in the wire) and the impurity backscattering rate ,
the conductance vs. voltage/temperature displays a zero-energy resonance.
Transport through a spin gapped 1D system is also described availing of duality
between the backscattered current of this system and the direct current of the
Mott-Hubbard insulator.Comment: 5 twocolumn pages in RevTex, no figure
Splitting electrons into quasiparticles with fractional edge-state Mach-Zehnder interferometer
We have studied theoretically the tunneling between two edges of Quantum Hall
liquids (QHL) of different filling factors, , with
, through two separate point contacts in the geometry of
Mach-Zehnder interferometer [Y. Ji et al., Nature {\bf 422}, 415 (2003); I.
Neder et al., Phys.\ Rev.\ Lett. {\bf 96}, 016804 (2006)]. The quasi-particle
formulation of the interferometer model is derived as a dual to the initial
electron model, in the limit of strong electron tunneling reached at large
voltages or temperatures. For , the tunneling of
quasiparticles of fractional charge leads to non-trivial -state
dynamics of effective flux through the interferometer, which restores the
regular "electron" periodicity of the current in flux despite the fractional
charge and statistics of quasiparticles. The exact solution available for equal
times of propagation between the contacts along the two edges demonstrates that
the interference pattern of modulation of the tunneling current by flux depends
on voltage and temperature only through a common amplitude.Comment: fourteen two-column pages in RevTex4, 4 eps figure, extended final
verson as appeared in PR
Antidot tunneling between Quantum Hall liquids with different filling factors
We consider tunneling through two point contacts between two edges of Quantum
Hall liquids of different filling factors with
. Properties of the antidot formed between the point
contacts in the strong-tunneling limit are shown to be very different from the
case, and include vanishing average total current in the two
contacts and quasiparticles of charge . For , quasiparticle tunneling
leads to non-trivial -state dynamics of effective flux through the antidot
which restores the regular ``electron'' periodicity of the current in flux
despite the fractional charge and statistics of quasiparticles.Comment: 5 two-column pages, 2 figure
- β¦