Signatures of spin-charge separation in double--quantum-wire tunneling

Details Signatures of spin-charge separation in double--quantum-wire tunneling Signatures of spin-charge separation in double--quantum-wire tunneling

2003-12-05

arxiv.org/abs/cond-mat/0312159v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Manuscript for proceedings of the NATO workshop on Theory of Quantum Transport in Metallic and Hybrid Nanostructures, St. Pete

Scientific paper

We present evidence for spin-charge separation in the tunneling spectrum of a system consisting of two quantum wires connected by a long narrow tunnel junction at the edge of a GaAs/AlGaAs bilayer heterostructure. Multiple excitation velocities are detected in the system by tracing out electron spectral peaks in the conductance dependence on the applied voltage, governing the energy of tunneled electrons, and the magnetic field, governing the momentum shift along the wires. The boundaries of the wires are important and lead to a characteristic interference pattern in measurements on short junctions. We show that the experimentally observed modulation of the conductance oscillation amplitude as a function of the voltage bias can also be accounted for by spin-charge separation of the elementary excitations in the interacting wires.

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