Exploring the properties of the
VB−
defect in hBN: optical spin polarization, Rabi oscillations, and coherent nuclei modulation
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Published:2024-01-25
Issue:15
Volume:35
Page:155001
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ISSN:0957-4484
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Container-title:Nanotechnology
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language:
-
Short-container-title:Nanotechnology
Author:
Murzakhanov Fadis FORCID,
Sadovnikova Margarita AORCID,
Gracheva Irina NORCID,
Mamin Georgy V,
Baibekov Eduard I,
Mokhov Evgeniy N
Abstract
Abstract
Optically active point defects in semiconductors have received great attention in the field of solid-state quantum technologies. Hexagonal boron nitride, with an ultra-wide band gap
E
g
= 6 eV, containing a negatively charged boron vacancy (
V
B
−
) with unique spin, optical, and coherent properties presents a new two-dimensional platform for the implementation of quantum technologies. This work establishes the value of
V
B
−
spin polarization under optical pumping with λ
ext = 532 nm laser using high-frequency (ν
mw = 94 GHz) electron paramagnetic resonance (EPR) spectroscopy. In optimal conditions polarization was found to be P ≈ 38.4%. Our study reveals that Rabi oscillations induced on polarized spin states persist for up to 30–40 μs, which is nearly two orders of magnitude longer than what was previously reported. Analysis of the coherent electron–nuclear interaction through the observed electron spin echo envelope modulation made it possible to detect signals from remote nitrogen and boron nuclei, and to establish a corresponding quadrupole coupling constant C
q
= 180 kHz related to nuclear quadrupole moment of 14N. These results have fundamental importance for understanding the spin properties of boron vacancy.
Funder
Ministry of Science and Higher Education
State Assignments of the Ministry of Science and Higher Education of the Russian Federation to Ioffe Institute
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Mechanics of Materials,General Materials Science,General Chemistry,Bioengineering