Title: Nitrogen vacancy center in diamond: a nanoscale quantum sensor for high pressure, and a novel platform to study out-of-equilibrium quantum dynamics
Speaker: Chong Zu UC Berkeley
Time: 2019-06-20 11:00-2019-06-20 12:00
Venue: FIT 1-222

Abstract:

Recent experimental advances have enabled the control and manipulation of individual quantum mechanical spins in solids. In this talk, I will introduce two directions our group is currently pursuing using nitrogen-vacancy centers in diamond, one of the most promising solid-state quantum defect [1,2,3], (1) by integrate NV centers directly into the diamond anvil cell (DAC), a workhorse for high pressure physics, we demonstrate the versatility of our quantum sensors by imaging both stress fields and magnetism, up to pressures ~30 GPa and for temperatures ranging from 25-340 K. (2) we introduce a novel platform, based upon NV center and surrounding dense P1 centers (substitutional nitrogen defects), to study non-equilibrium quantum spin dynamics. In particular, we show the ability to directly control the disorder strength, the interaction Hamiltonian and the effective P1 density using a combination of static and driven fields. By preparing a low entropy initial state, we probe the nanoscale spin diffusion of P1 centers, ultimately observing the emergence of hydrodynamics.

References:

[1] S. Hsieh*, P. Bhattacharyya*, C. Zu*, et al., Imaging stress and magnetism at high pressures using a nanoscale quantum sensor, arXiv:1812.08796, accepted to Science
[2] T. Mittiga*, S. Hsieh*, C. Zu*, et al., Imaging the Local Charge Environment of Nitrogen-Vacancy Centers in Diamond, Phys. Rev. Lett. 121, 246402 (2018)
[3] Zu, C, et al., In preparation, 2019



Short Bio:

Bio: Chong Zu is currently a postdoc in Prof. Norman Yao's group at department of physics, University of California, Berkeley. He received his Ph.D from Tsinghua University, in 2016, under the supervision of Prof. Luming Duan. Prior to that, he received his Bachelor from department of physics, Tsinghua University in 2011.