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Spin Squeezing as a Probe of Emergent Quantum Orders

Conference · · Proceedings of the 29th International Conference on Low Temperature Physics (LT29)
 [1];  [1];  [2];  [3];  [1]
  1. Brown University, Providence, RI (United States)
  2. University of Tennessee, Knoxville, TN (United States)
  3. Dartmouth College, Hanover, NH (United States)
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Nuclear magnetic resonance (NMR) experiments can reveal local properties in materials, but are often limited by the low signal-to-noise ratio. Spin squeezed states have an improved resolution below the Heisenberg limit in one of the spin components, and have been extensively used to improve the sensitivity of atomic clocks, for example [1]. Interacting and entangled spin ensembles with non-linear coupling are a natural candidate for implementing squeezing. Furthermore, we propose measurement of the spin-squeezing parameter that itself can act as a local probe of emergent orders in quantum materials. In particular, we demonstrate how to investigate an anisotropic electric field gradient via its coupling to the nuclear quadrupole moment. While squeezed spin states are pure, the squeezing parameter can be estimated for both pure and mixed states. We evaluate the range of fields and temperatures for which a thermal-equilibrium state is sufficient to improve the resolution in an NMR experiment and probe relevant parameters of the quadrupole Hamiltonian, including its anisotropy.

Research Organization:
Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
DOE Contract Number:
SC0022311; OIA-192199; DMR 1905532
OSTI ID:
2216889
Journal Information:
Proceedings of the 29th International Conference on Low Temperature Physics (LT29), Conference: 29. International Conference on Low Temperature Physics (LT29), Sapporo (Japan), 18-24 Aug 2022
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
Spin squeezing
Quadrupole moment
Electric field gradient
NMR