Direct Measurement of Hyperfine Shifts and Radio Frequency Manipulation of Nuclear Spins in Individual CdTe/ZnTe Quantum Dots

We achieve direct detection of electron hyperfine shifts in individual CdTe/ZnTe quantum dots. For the previously inaccessible regime of strong magnetic fields B_{z}≳0.1  T, we demonstrate robust polarization of a few-hundred-particle nuclear spin bath, with an optical initialization time of ∼1  ms...

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Bibliographic Details
Published in:Physical review letters 2019-03, Vol.122 (9), p.096801-096801, Article 096801
Main Authors: Ragunathan, G, Kobak, J, Gillard, G, Pacuski, W, Sobczak, K, Borysiuk, J, Skolnick, M S, Chekhovich, E A
Format: Article
Language:English
Subjects:
Cadmium tellurides
Electron spin
Electrons
NMR
Nuclear interactions
Nuclear magnetic resonance
Nuclear spin
Optical properties
Particle spin
Polarization
Quantum dots
Quantum theory
Qubits (quantum computing)
Zinc tellurides
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Summary:We achieve direct detection of electron hyperfine shifts in individual CdTe/ZnTe quantum dots. For the previously inaccessible regime of strong magnetic fields B_{z}≳0.1  T, we demonstrate robust polarization of a few-hundred-particle nuclear spin bath, with an optical initialization time of ∼1  ms and polarization lifetime exceeding ∼1  s. Nuclear magnetic resonance spectroscopy of individual dots reveals strong electron-nuclear interactions characterized by Knight fields |B_{e}|≳50  mT, an order of magnitude stronger than in III-V semiconductor quantum dots. Our studies confirm II-VI semiconductor quantum dots as a promising platform for hybrid electron-nuclear spin qubit registers, combining the excellent optical properties comparable to III-V dots and the dilute nuclear spin environment similar to group-IV semiconductors.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.096801