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SUMMARY:New studies on the g-factors of 1D holes on GaAs quantum point con
 tacts - Karina Hudson\, University of New South Wales
DTSTART:20170616T131500Z
DTEND:20170616T141500Z
UID:TALK73061@talks.cam.ac.uk
CONTACT:Dr Joanna Waldie
DESCRIPTION:A complete description of the spin response of 1D holes in qua
 ntum point contacts (QPCs) has remained an outstanding problem in spintron
 ics. Despite this being a simple one-dimensional non-interacting problem\,
  for 10 years no single theory has been been able to model the gzz >> g|| 
 >> gperp form of the g-tensor seen time and again in Zeeman spin-splitting
  measurements on hole QPCs. However\, newly developed theory from Dmitry M
 iserev et. al. on 1D holes in QPCs predicts that g|| is insensitive to Ras
 hba\, while gperp is highly sensitive. This model has successfully describ
 ed the g-factor measured via Zeeman spin-splitting measurements for QPCs o
 n quantum well (100) wafers [1]\, and is a promising candidate for explain
 ing spin-behaviour in single heterojunction wafers with a strong Rashba fi
 eld. In order to fully explore the effect of Rashba field on 1D holes\, we
  are hoping to fabricate hole QPC devices on Cambridge wafer with an in-si
 tu backgate in the very near future\, which is an ongoing project with Dr.
  Joanna Waldie and the MBE growers at the Cavendish Laboratory. We have al
 so started measuring Zeeman spin-splitting on p-type (111) GaAs wafer\, wh
 ere Rashba and Dresselhaus terms are predicted to anti-align and cause a s
 uppression in the effective magnetic field\, resulting in novel spin-behav
 iour [2].\n\n \n\n[1] D. Miserev\, et. al. arXiv:1612.00572 [cond-mat.mes-
 hall]                                    \n\n[2] L.Wang and M.W.Wu\, Phys.
  Rev. B. 85\, 235308 (2012)
LOCATION:Mott Seminar Room (Mott Building Room 531)\, Cavendish Laboratory
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