Joonhee Choi - Stanford University

US/Eastern
IAMM

IAMM

2641 Osprey Vista Way, Knoxville, TN 37920
Wonhee Ko (University of Tennessee, Knoxville)
Description

https://choilab.stanford.edu/

    • 13:00 13:20
      Pick up at Conference 20m

      Travel to IAMM.

      Speaker: Wonhee Ko (University of Tennessee, Knoxville)
    • 13:20 14:20
      Quantum sensing with a spin ensemble in a two-dimensional material 1h 147

      147

      IAMM

      Quantum sensing with solid-state spin defects has transformed nanoscale metrology, offering sub-wavelength spatial resolution with exceptional sensitivity to multiple signal types. Maximizing these advantages requires minimizing both the sensor-target separation and detectable signal threshold. However, leading platforms such as nitrogen-vacancy centers in diamond suffer performance degradation near surfaces or in nanoscale volumes, motivating the search for optically addressable spin sensors in atomically thin, 2D materials. Here, we present an experimental framework to probe a novel 2D spin ensemble, including its Hamiltonian, coherent sensing dynamics, and noise environment. We achieve a record coherence time of 80 μs and nanotesla-level AC magnetic sensitivity at a 10 nm target distance, reaching the threshold for detecting a single nuclear spin in nanoscale spectroscopy. Leveraging the broad opportunities for defect engineering in atomically thin hosts, these results lay the foundation for next-generation quantum sensors with ultrahigh sensitivity, tunable noise selectivity, and versatile quantum functionalities.

    • 14:20 14:30
      Break 10m
    • 14:30 15:00
      Research Meeting 30m 257

      257

      IAMM

      Speaker: Yang Zhang
    • 15:00 15:30
      Research Meeting 30m 254

      254

      Speaker: Joon Sue Lee (University of Tennessee, Knoxville)
    • 15:30 16:00
      Research Meeting 30m 323

      323

      Speaker: Ruixing Zhang (Department of Physics and Astronomy, University of Tennessee Knoxville)
    • 16:00 16:30
      Research Meeting 30m
    • 16:30 17:00
      Research Meeting 30m 233

      233

      IAMM

      Speaker: Wonhee Ko (University of Tennessee, Knoxville)