Mesoscopic conductance effects in InMnAs structures

Quantum corrections to the electrical conduction of magnetic semiconductors are comparatively unexplored. The authors report measurements of time-dependent universal conductance fluctuations (TDUCFs) and magnetic field dependent universal conductance fluctuations (MFUCFs) in micron-scale structures fabricated from two different In1−xMnxAs thin films. TDUCF and MFUCF increasing in magnitude with decreasing temperature are observed. At 4K and below, TDUCFs are suppressed at finite magnetic fields independent of field orientation.

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