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Freely suspended quantum point contacts

✍ Scribed by C. Rössler; M. Herz; M. Bichler; S. Ludwig

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
802 KB
Volume
150
Category
Article
ISSN
0038-1098

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✦ Synopsis

We present a versatile design of freely suspended quantum point contacts with particular large onedimensional subband quantization energies of up to ∆ε ≈ 10 meV. The nanoscale bridges embedding a two-dimensional electron system are fabricated from AlGaAs/GaAs heterostructures by electronbeam 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 split spin-gap of the two lowest Landau-levels.

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