g-factors in LaAlO3/SrTiO3 quantum dots
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g-factors in LaAlO3/SrTiO3 quantum dots. / Bjorlig, Anders V.; Carrad, Damon J.; Prawiroatmodjo, Guenevere E. D. K.; von Soosten, Merlin; Gan, Yulin; Chen, Yunzhong; Pryds, Nini; Paaske, Jens; Jespersen, Thomas S.
I: Physical Review Materials, Bind 4, Nr. 12, 122001, 03.12.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - g-factors in LaAlO3/SrTiO3 quantum dots
AU - Bjorlig, Anders V.
AU - Carrad, Damon J.
AU - Prawiroatmodjo, Guenevere E. D. K.
AU - von Soosten, Merlin
AU - Gan, Yulin
AU - Chen, Yunzhong
AU - Pryds, Nini
AU - Paaske, Jens
AU - Jespersen, Thomas S.
PY - 2020/12/3
Y1 - 2020/12/3
N2 - We investigate the g-factors of individual electron states in gate-defined quantum dots fabricated from LaAlO3/SrTiO3 heterostructures. We consider both the case of effective positive charging energy (U > 0) where single electrons are added upon increasing the local gate voltage, and the case of U <0 where electron pairing is observed. The g-factors are extracted from the field dependence of the quantum dot addition spectrum. Tunnel couplings and confinement are tunable by the gate voltages and in the regime of weakest coupling, we find g-factors close to 2 due to quenching of the orbital magnetic moment. For stronger coupling, g-factors are anisotropic and exhibit values up to similar to 4.5 in the out-of-plane orientation. We further show examples of the sequential addition of electrons with the same spin as a consequence of exchange interactions.
AB - We investigate the g-factors of individual electron states in gate-defined quantum dots fabricated from LaAlO3/SrTiO3 heterostructures. We consider both the case of effective positive charging energy (U > 0) where single electrons are added upon increasing the local gate voltage, and the case of U <0 where electron pairing is observed. The g-factors are extracted from the field dependence of the quantum dot addition spectrum. Tunnel couplings and confinement are tunable by the gate voltages and in the regime of weakest coupling, we find g-factors close to 2 due to quenching of the orbital magnetic moment. For stronger coupling, g-factors are anisotropic and exhibit values up to similar to 4.5 in the out-of-plane orientation. We further show examples of the sequential addition of electrons with the same spin as a consequence of exchange interactions.
U2 - 10.1103/PhysRevMaterials.4.122001
DO - 10.1103/PhysRevMaterials.4.122001
M3 - Journal article
VL - 4
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2476-0455
IS - 12
M1 - 122001
ER -
ID: 255161388