Abstract
Magnetotransport spectroscopy is carried out on quantum point contacts fabricated from a 30-nm-wide square quantum well with two occupied two-dimensional subbands. In this system the spatial region of one-dimensional mode coupling is well defined and the two-dimensional reservoirs do not cause interferences. The magnetodispersions in transversal and longitudinal magnetic fields show crossings and anticrossings of the energy levels of the two one-dimensional subladders depending on the parity of the lateral modes of the wave functions. The influence of the quantum point contact geometry and persistent charging effects on coupling is demonstrated.
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