Shielding of external magnetic field by dynamic nuclear polarization in (In,Ga)As quantum dots

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Shielding of external magnetic field by dynamic nuclear polarization in (In,Ga)As quantum dots. / Evers, E.; Kopteva, N. E.; Yugova, I. A.; Yakovlev, D. R.; Bayer, M.; Greilich, A.

In: Physical Review B, Vol. 104, No. 7, 075302, 10.08.2021.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{d639c88689d248488c4ecfd4ee0ea14a,

title = "Shielding of external magnetic field by dynamic nuclear polarization in (In,Ga)As quantum dots",

abstract = "The dynamics of the coupled electron-nuclear spin system is studied in an ensemble of singly charged (In,Ga)As/GaAs quantum dots (QDs) using periodic optical excitation at 1 GHz repetition rate. In combination with the electron-nuclei interaction, the highly repetitive excitation allows us to lock the electron spins into magnetic resonance in a transverse external magnetic field. Sweeping the field to higher values, the locking leads to an effective {"}diamagnetic{"}response of significant strength due to dynamic nuclear polarization, which shields the QD electrons at least partly from the external field and can even keep the internal magnetic field constant up to 1.3 T field variation. We model the effect through a magnetic field-dependent polarization rate of the nuclei, from which we suggest a strategy for adjusting the nuclear polarization through the detuning between optical excitation and electronic transition, in addition to tuning the magnetic field.",

keywords = "LOCKING",

author = "E. Evers and Kopteva, {N. E.} and Yugova, {I. A.} and Yakovlev, {D. R.} and M. Bayer and A. Greilich",

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = aug,

day = "10",

doi = "10.1103/PhysRevB.104.075302",

language = "English",

volume = "104",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Physical Society",

number = "7",

}

RIS

TY - JOUR

T1 - Shielding of external magnetic field by dynamic nuclear polarization in (In,Ga)As quantum dots

AU - Evers, E.

AU - Kopteva, N. E.

AU - Yugova, I. A.

AU - Yakovlev, D. R.

AU - Bayer, M.

AU - Greilich, A.

PY - 2021/8/10

Y1 - 2021/8/10

N2 - The dynamics of the coupled electron-nuclear spin system is studied in an ensemble of singly charged (In,Ga)As/GaAs quantum dots (QDs) using periodic optical excitation at 1 GHz repetition rate. In combination with the electron-nuclei interaction, the highly repetitive excitation allows us to lock the electron spins into magnetic resonance in a transverse external magnetic field. Sweeping the field to higher values, the locking leads to an effective "diamagnetic"response of significant strength due to dynamic nuclear polarization, which shields the QD electrons at least partly from the external field and can even keep the internal magnetic field constant up to 1.3 T field variation. We model the effect through a magnetic field-dependent polarization rate of the nuclei, from which we suggest a strategy for adjusting the nuclear polarization through the detuning between optical excitation and electronic transition, in addition to tuning the magnetic field.

AB - The dynamics of the coupled electron-nuclear spin system is studied in an ensemble of singly charged (In,Ga)As/GaAs quantum dots (QDs) using periodic optical excitation at 1 GHz repetition rate. In combination with the electron-nuclei interaction, the highly repetitive excitation allows us to lock the electron spins into magnetic resonance in a transverse external magnetic field. Sweeping the field to higher values, the locking leads to an effective "diamagnetic"response of significant strength due to dynamic nuclear polarization, which shields the QD electrons at least partly from the external field and can even keep the internal magnetic field constant up to 1.3 T field variation. We model the effect through a magnetic field-dependent polarization rate of the nuclei, from which we suggest a strategy for adjusting the nuclear polarization through the detuning between optical excitation and electronic transition, in addition to tuning the magnetic field.

KW - LOCKING

UR - http://www.scopus.com/inward/record.url?scp=85113135511&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.104.075302

DO - 10.1103/PhysRevB.104.075302

M3 - Article

AN - SCOPUS:85113135511

VL - 104

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 7

M1 - 075302

ER -

ID: 86057041