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Träfflista för sökning "WFRF:(Pepper C) srt2:(2003-2004)"

Sökning: WFRF:(Pepper C) > (2003-2004)

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1.
  • Graham, A.C., et al. (författare)
  • 0.7 Analogue structures and exchange interactions in quantum wires
  • 2004
  • Ingår i: Solid State Communications. - : Elsevier BV. - 0038-1098 .- 1879-2766. ; 131:9-10 SPEC. ISS., s. 591-597
  • Tidskriftsartikel (refereegranskat)abstract
    • We present experimental studies of crossings of spin-split one-dimensional subbands in ballistic quantum wires in an in-plane magnetic field B ?. At low electron densities, a spontaneous spin-splitting occurs as subbands cross, which gives rise to additional non-quantised conductance structures called 0.7 analogues. We analyse the data within a spin-density-functional model, which includes exchange interactions in a magnetic field. Focussing on the region of the crossings of spin-split subbands, it is found that the energy levels rearrange as they cross due to exchange interactions. © 2004 Elsevier Ltd. All rights reserved.
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2.
  • Starikov, Anton, et al. (författare)
  • Effects of accidental microconstriction on the quantized conductance in long wires
  • 2003
  • Ingår i: Proceedings of SPIE, the International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. ; 5023, s. 267-270
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • We have investigated the conductance of long quantum wires formed in GaAs/ AlxGa1-x As heterostructures. Using realistic fluctuation potentials from donor layers we have simulated numerically the conductance of four different kinds of wires. While ideal wires show perfect quantization, potential fluctuations from random donors may give rise to strong conductance oscillations and degradation of the quantization plateaux. Statistically there is always the possibility of having large fluctuations in a sample that may effectively act as a microconstriction. We therefore introduce microconstrictions in the wires by occasional clustering of donors. These microconstrictions are found to restore the quantized plateaux. A similar effect is found for accidental lithographic inaccuracies.
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