Fano resonances in transport across a quantum well in a tilted magnetic field

Asymmetric Fano resonances are predicted to occur in the linear electronic conductance across a shallow quantum well in a high magnetic field. The Fano line shape results from the interference between direct transmission and transmission via a quasibound state in the well which is weakly mixed with the continuum by tilting the field. The resonance width increases with tilt angle but general S-matrix theory predicts that the line shapes remain approximately unchanged upon rescaling of the field. This reflects a general property of Fano resonances which may be tested experimentally.