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Title: Spin of a Multielectron Quantum Dot and Its Interaction with a Neighboring Electron

Abstract

We investigate the spin of a multielectron GaAs quantum dot in a sequence of nine charge occupancies, by exchange coupling the multielectron dot to a neighboring two-electron double quantum dot. For all nine occupancies, we make use of a leakage spectroscopy technique to reconstruct the spectrum of spin states in the vicinity of the interdot charge transition between a single- and a multielectron quantum dot. In the same regime we also perform time-resolved measurements of coherent exchange oscillations between the single- and multielectron quantum dot. With these measurements, we identify distinct characteristics of the multielectron spin state, depending on whether the dot’s occupancy is even or odd. For three out of four even occupancies, we do not observe any exchange interaction with the single quantum dot, indicating a spin-0 ground state. For the one remaining even occupancy, we observe an exchange interaction that we associate with a spin-1 multielectron quantum dot ground state. For all five of the odd occupancies, we observe an exchange interaction associated with a spin-1/2 ground state. For three of these odd occupancies, we clearly demonstrate that the exchange interaction changes sign in the vicinity of the charge transition. For one of these, the exchange interactionmore » is negative (i.e., triplet preferring) beyond the interdot charge transition, consistent with the observed spin-1 for the next (even) occupancy. Our experimental results are interpreted through the use of a Hubbard model involving two orbitals of the multielectron quantum dot. Allowing for the spin correlation energy (i.e., including a term favoring Hund’s rules) and different tunnel coupling to different orbitals, we qualitatively reproduce the measured exchange profiles for all occupancies.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1427567
Alternate Identifier(s):
OSTI ID: 1499094
Grant/Contract Number:  
SC0006671
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 8 Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Malinowski, Filip K., Martins, Frederico, Smith, Thomas B., Bartlett, Stephen D., Doherty, Andrew C., Nissen, Peter D., Fallahi, Saeed, Gardner, Geoffrey C., Manfra, Michael J., Marcus, Charles M., and Kuemmeth, Ferdinand. Spin of a Multielectron Quantum Dot and Its Interaction with a Neighboring Electron. United States: N. p., 2018. Web. doi:10.1103/PhysRevX.8.011045.
Malinowski, Filip K., Martins, Frederico, Smith, Thomas B., Bartlett, Stephen D., Doherty, Andrew C., Nissen, Peter D., Fallahi, Saeed, Gardner, Geoffrey C., Manfra, Michael J., Marcus, Charles M., & Kuemmeth, Ferdinand. Spin of a Multielectron Quantum Dot and Its Interaction with a Neighboring Electron. United States. doi:10.1103/PhysRevX.8.011045.
Malinowski, Filip K., Martins, Frederico, Smith, Thomas B., Bartlett, Stephen D., Doherty, Andrew C., Nissen, Peter D., Fallahi, Saeed, Gardner, Geoffrey C., Manfra, Michael J., Marcus, Charles M., and Kuemmeth, Ferdinand. Wed . "Spin of a Multielectron Quantum Dot and Its Interaction with a Neighboring Electron". United States. doi:10.1103/PhysRevX.8.011045.
@article{osti_1427567,
title = {Spin of a Multielectron Quantum Dot and Its Interaction with a Neighboring Electron},
author = {Malinowski, Filip K. and Martins, Frederico and Smith, Thomas B. and Bartlett, Stephen D. and Doherty, Andrew C. and Nissen, Peter D. and Fallahi, Saeed and Gardner, Geoffrey C. and Manfra, Michael J. and Marcus, Charles M. and Kuemmeth, Ferdinand},
abstractNote = {We investigate the spin of a multielectron GaAs quantum dot in a sequence of nine charge occupancies, by exchange coupling the multielectron dot to a neighboring two-electron double quantum dot. For all nine occupancies, we make use of a leakage spectroscopy technique to reconstruct the spectrum of spin states in the vicinity of the interdot charge transition between a single- and a multielectron quantum dot. In the same regime we also perform time-resolved measurements of coherent exchange oscillations between the single- and multielectron quantum dot. With these measurements, we identify distinct characteristics of the multielectron spin state, depending on whether the dot’s occupancy is even or odd. For three out of four even occupancies, we do not observe any exchange interaction with the single quantum dot, indicating a spin-0 ground state. For the one remaining even occupancy, we observe an exchange interaction that we associate with a spin-1 multielectron quantum dot ground state. For all five of the odd occupancies, we observe an exchange interaction associated with a spin-1/2 ground state. For three of these odd occupancies, we clearly demonstrate that the exchange interaction changes sign in the vicinity of the charge transition. For one of these, the exchange interaction is negative (i.e., triplet preferring) beyond the interdot charge transition, consistent with the observed spin-1 for the next (even) occupancy. Our experimental results are interpreted through the use of a Hubbard model involving two orbitals of the multielectron quantum dot. Allowing for the spin correlation energy (i.e., including a term favoring Hund’s rules) and different tunnel coupling to different orbitals, we qualitatively reproduce the measured exchange profiles for all occupancies.},
doi = {10.1103/PhysRevX.8.011045},
journal = {Physical Review. X},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevX.8.011045

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