Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-24
Phys. Rev. B 75, 035331 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 4 figures
Scientific paper
10.1103/PhysRevB.75.035331
We study the effects of electron-electron interactions on the energy levels of GaAs quantum wires (QWs) using finite-bias spectroscopy. We probe the energy spectrum at zero magnetic field, and at crossings of opposite-spin-levels in high in-plane magnetic field B. Our results constitute direct evidence that spin-up (higher energy) levels pin to the chemical potential as they populate. We also show that spin-up and spin-down levels abruptly rearrange at the crossing in a manner resembling the magnetic phase transitions predicted to occur at crossings of Landau levels. This rearranging and pinning of subbands provides a phenomenological explanation for the 0.7 structure, a one-dimensional (1D) nanomagnetic state, and its high-B variants.
Graham A. C.
Pepper Michael
Ritchie Dave A.
Sawkey D. L.
Simmons Michelle Y.
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