Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Correlated Electrons: Low-dimensional Systems - Models 2
TT 16.13: Vortrag
Dienstag, 27. März 2012, 12:45–13:00, H 0104
The effect of a local perturbation in a fermionic ladder — Sam Carr1, •Boris Narozhny1, and Alexander Nersesyan2,3,4 — 1Institut für Theorie der Kondensierten Materie and DFG Center for Functional Nanostructures, Karlsruher Institut für Technologie, 76128 Karlsruhe, Germany — 2The Abdus Salam International Centre for Theoretical Physics, 34100, Trieste, Italy — 3The Andronikashvili Institute of Physics, 0177, Tbilisi, Georgia — 4Ilia State University, Institute of Theoretical Physics, 0162, Tbilisi, Georgia
We study the effect of a local external potential on a system of two parallel nanowires placed close to each other. For single channel, spin-polarized nanowires with repulsive interaction we find that transport properties of the system are highly sensitive to the transverse gradient of the perturbation: the asymmetric part completely reflects the electrons leading to vanishing conductance at zero temperature, while the flat potential remains transparent. We envisage a possible application of this unusual property in the sensitive measurement of local potential field gradients. We then further extend our results to the case of nanowires in the absence of the polarized field.