A junction of three quantum wires: restoring time-reversal symmetry by interaction

Details A junction of three quantum wires: restoring time-reversal symmetry by interaction A junction of three quantum wires: restoring time-reversal symmetry by interaction

2004-11-24

arxiv.org/abs/cond-mat/0411612v2

Phys. Rev. Lett. 94, 136405 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, version accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.136405

We investigate transport of correlated fermions through a junction of three one-dimensional quantum wires pierced by a magnetic flux. We determine the flow of the conductance as a function of a low-energy cutoff in the entire parameter space. For attractive interactions and generic flux the fixed point with maximal asymmetry of the conductance is the stable one, as conjectured recently. For repulsive interactions and arbitrary flux we find a line of stable fixed points with vanishing conductance as well as stable fixed points with symmetric conductance (4/9)(e^2/h).

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