TY  - JOUR
AU  - Herzog, F.
AU  - Heedt, S.
AU  - Goerke, S.
AU  - Ibrahim, A.
AU  - Rupprecht, B.
AU  - Heyn, Ch
AU  - Hardtdegen, H.
AU  - Schäpers, Thomas
AU  - Wilde, M. A.
AU  - Grundler, D.
TI  - Confinement and inhomogeneous broadening effects in the quantum oscillatory magnetization of quantum dot ensemble
JO  - Journal of physics / Condensed matter
VL  - 28
IS  - 4
SN  - 1361-648X
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2016-01452
SP  - 045301 -
PY  - 2016
AB  - We report on the magnetization of ensembles of etched quantum dots with a lateral diameter of 460nm, which we prepared from InGaAs/InP heterostructures. The quantum dots exhibit 1/B-periodic de-Haas-van-Alphen-type oscillations in the magnetization M(B) for external magnetic fields B>2 T, measured by torque magnetometry at 0.3 K. We compare the experimental data to model calculations assuming different confinement potentials and including ensemble broadening effects. The comparison shows that a hard wall potential with an edge depletion width of 100nm explains the magnetic behavior. Beating patterns induced by Rashba spin-orbit interaction (SOI) as measured in unpatterned and nanopatterned InGaAs/InP heterostructures are not observed for the quantum dots. From our model we predict that signatures of SOI in the magnetization could be observed in larger dots in tilted magnetic fields.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000368762900006
DO  - DOI:10.1088/0953-8984/28/4/045301
UR  - https://juser.fz-juelich.de/record/281770
ER  -