%0 Unpublished work
%T Nuclear spin-spin interactions in CdTe probed by zero and ultra-low-field optically detected NMR
%+ St Petersburg State University (SPbU)
%+ Nanophysique et Semiconducteurs (NEEL - NPSC)
%+ Laboratoire Charles Coulomb (L2C)
%A Litvyak, V. M.
%A Bazhin, P.
%A André, Régis
%A Vladimirova, Masha
%A Kavokin, K. V.
%Z 9 pages, 7 figures, 2 tables
%8 2024-03-28
%D 2024
%Z 2403.17593
%Z Physics [physics]/Condensed Matter [cond-mat]Preprints, Working Papers, ...
%X Nuclear magnetic resonance (NMR) is particularly relevant for studies of internuclear spin coupling at zero and ultra-low fields (ZULF), where spin-spin interactions dominate over Zeeman ones. Here we report on ZULF NMR in CdTe. In this semiconductor all magnetic isotopes have spin $I = 1/2$, so that internuclear interactions are never overshadowed by quadrupole effects. Our experiments rely on warm-up spectroscopy, a technique that combines optical pumping, additional cooling via adiabatic demagnetisation, and detection of the oscillating magnetic field-induced warm-up of the nuclear spin system via Hanle effect. We show that NMR spectra exhibit a rich fine structure, consistent with the low abundance of magnetic isotopes in CdTe, their zero quadrupole moments, as well as direct and indirect interactions between them. A model assuming that the electromagnetic radiation is absorbed by nuclear spin clusters composed of up to 5 magnetic isotopes allows us to reproduce the shape of a major part of the measured spectra.
%G English
%2 https://hal.science/hal-04525413/document
%2 https://hal.science/hal-04525413/file/preprint_Litvyak_al_2024.pdf
%L hal-04525413
%U https://hal.science/hal-04525413
%~ UGA
%~ CNRS
%~ INPG
%~ NEEL
%~ L2C
%~ NEEL-NPSC
%~ UNIV-MONTPELLIER
%~ UGA-EPE
%~ UM-2015-2021
%~ UM-EPE