Research output: Contribution to journal › Article
Hanle effect in (In,Ga)As quantum dots: Role of nuclear spin fluctuations. / Kuznetsova, M.S.; Flisinski, K.; Gerlovin, I.Y.; Ignatiev, I.V.; Kavokin, K.V.; Verbin, S.Y.; Yakovlev, D.R.; Reuter, D.; Wieck, A.D.; Bayer, M.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 23, 235320, 2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hanle effect in (In,Ga)As quantum dots: Role of nuclear spin fluctuations
AU - Kuznetsova, M.S.
AU - Flisinski, K.
AU - Gerlovin, I.Y.
AU - Ignatiev, I.V.
AU - Kavokin, K.V.
AU - Verbin, S.Y.
AU - Yakovlev, D.R.
AU - Reuter, D.
AU - Wieck, A.D.
AU - Bayer, M.
PY - 2013
Y1 - 2013
N2 - The role of nuclear spin fluctuations in the dynamic polarization of nuclear spins by electrons is investigated in (In,Ga)As/GaAs quantum dots. The photoluminescence polarization under circularly polarized optical pumping in transverse magnetic fields (Hanle effect) is studied. A weak additional magnetic field parallel to the optical axis is used to control the efficiency of nuclear spin cooling and the sign of nuclear spin temperature. The shape of the Hanle curve is drastically modified when changing this control field, as observed earlier in bulk semiconductors and quantum wells. However, the standard nuclear spin cooling theory, operating with the mean nuclear magnetic field (Overhauser field), fails to describe the experimental Hanle curves in a certain range of control fields. This controversy is resolved by taking into account the nuclear spin fluctuations owed to the finite number of nuclei in the quantum dot. We propose a model considering cooling of the nuclear spin system by electron spins experiencing fast v
AB - The role of nuclear spin fluctuations in the dynamic polarization of nuclear spins by electrons is investigated in (In,Ga)As/GaAs quantum dots. The photoluminescence polarization under circularly polarized optical pumping in transverse magnetic fields (Hanle effect) is studied. A weak additional magnetic field parallel to the optical axis is used to control the efficiency of nuclear spin cooling and the sign of nuclear spin temperature. The shape of the Hanle curve is drastically modified when changing this control field, as observed earlier in bulk semiconductors and quantum wells. However, the standard nuclear spin cooling theory, operating with the mean nuclear magnetic field (Overhauser field), fails to describe the experimental Hanle curves in a certain range of control fields. This controversy is resolved by taking into account the nuclear spin fluctuations owed to the finite number of nuclei in the quantum dot. We propose a model considering cooling of the nuclear spin system by electron spins experiencing fast v
KW - квантовые точки. спины. поле Найта
U2 - 10.1103/PhysRevB.87.235320
DO - 10.1103/PhysRevB.87.235320
M3 - Article
VL - 87
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 23
M1 - 235320
ER -
ID: 5634021