Experimental investigation of the breakdown of the Onsager-Casimir relations
C.A. Marlow, R.P. Taylor, M.Fairbanks, I. Shorubalko, H. Linke
TL;DR
This study experimentally examines how magnetic field reversal affects nonlinear conductance in semiconductor billiards, revealing linear asymmetries and unexpected spectral differences related to geometry and bias.
Contribution
It provides the first detailed experimental analysis of Onsager-Casimir relation breakdown in phase-coherent semiconductor billiards, highlighting geometry-dependent asymmetries.
Findings
Asymmetric conductance contribution is linear in magnetic field.
Asymmetry magnitude depends on billiard geometry.
Unexpected spectral asymmetry with respect to magnetic field and bias.
Abstract
We use magnetoconductance fluctuation measurements of phase-coherent semiconductor billiards to quantify the contributions to the nonlinear electric conductance that are asymmetric under reversal of magnetic field. We experimentally determine that the average asymmetric contribution is linear in magnetic field (for magnetic flux much larger than one flux quantum) and that its magnitude depends on billiard geometry. In addition, we find an unexpected asymmetry in the power spectrum characteristics of the magnetoconductance with respect to reversal of magnetic field and bias voltage.
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