MAGNETOTRANSPORT SPECTROSCOPY OF DUAL ONE-DIMENSIONAL ELECTRON SYSTEMS

Abstract

A review is given on the merits of magnetotransport spectroscopy for investigations of the subband structure of dual one-dimensional electron systems (1DES). In particular, spatially coincident and tunnel-coupled vertically stacked dual 1DES are discussed which were prepared by nanolithography with subband spacings of more than 10 meV. Mode coupling between degenerate one-dimensional (1D) subbands depends on the symmetry of the confining potential and the coupling strength. In dual 1DES with different 1D confining potentials each subband structure can be identified by magnetotransport spectroscopy on behalf of the distinct magnetic field dispersions. Exemplarily, mode spectra in longitudinal and transversal applied magnetic fields are discussed for spatially coincident 1DES with an asymmetric vertical component in the 1D confinement. Nearly identical confinement, instead, can be prepared for example in vertically stacked tunnel-coupled 1DES. Here, longitudinal magnetic fields have strong influence on tunnel-coupled modes.