Magneto-electrical subbands of freely suspended quantum point contacts

Details Magneto-electrical subbands of freely suspended quantum point contacts Magneto-electrical subbands of freely suspended quantum point contacts

2009-05-25

arxiv.org/abs/0905.3969v1

Solid State Communications 150 (2010) 861-864

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1016/j.ssc.2010.02.005

We present a versatile design of freely suspended quantum point contacts with particular large one-dimensional subband quantization energies of up to 10meV. The nanoscale bridges embedding a two-dimensional electron system are fabricated from AlGaAs/GaAs heterostructures by electron-beam lithography and etching techniques. Narrow constrictions define quantum point contacts that are capacitively controlled via local in-plane side gates. Employing transport spectroscopy, we investigate the transition from electrostatic subbands to Landau-quantization in a perpendicular magnetic field. The large subband quantization energies allow us to utilize a wide magnetic field range and thereby observe a large exchange splitted spin-gap of the two lowest Landau-levels.

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