Magnetic field symmetry and phase rigidity of the nonlinear conductance in a ring

Details Magnetic field symmetry and phase rigidity of the nonlinear conductance in a ring Magnetic field symmetry and phase rigidity of the nonlinear conductance in a ring

2005-11-25

arxiv.org/abs/cond-mat/0511631v2

Phys. Rev. Lett. 96, 126801 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.126801

We have performed nonlinear transport measurements as a function of a perpendicular magnetic field in a semiconductor Aharonov-Bohm ring connected to two leads. While the voltage-symmetric part of the conductance is symmetric in magnetic field, the voltage-antisymmetric part of the conductance is not symmetric. These symmetry relations are compatible with the scattering theory for nonlinear mesoscopic transport. The observed asymmetry can be tuned continuously by changing the gate voltages near the arms of the ring, showing that the phase of the nonlinear conductance in a two-terminal interferometer is not rigid, in contrast to the case for the linear conductance.

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