Group seminar via Zoom: Exploring many-body quantum dynamics with magnetic resonance in solids

Diep Nguyen, Nagoya University, Japan
Group seminar via Zoom
Thursday, March 28 at 09.00 am (MEZ)

Abstract: In this talk, I will first introduce the nuclear magnetic resonance (NMR) technique to explore many-body quantum states in condensed matter, by utilizing the local probe of NMR static and dynamical observables. In a specific problem of frustrated magnetism, we investigated the temperature dependence of spin dynamics showing dimensional crossover in a quasi-1D spin-1/2 triangular-lattice antiferromagnet Ca3ReO5Cl2 via 35Cl NMR measurements. At low temperatures, the spin-lattice relaxation rate 1/𝑇1 governed by spin correlation follows a power law evolution towards the Neel transition into the critical antiferromagnetic ordering. This power law relation characterizes the low-lying spinon excitation of the Tomonaga-Luttinger liquid state according to the bosonization theory. In another study, I will introduce the optically detected magnetic resonance (ODMR) technique in nitrogen-vacancy (NV) color centers in diamonds. I will elaborate on the optics and electronics apparatus, as well as the implementation of microwave pulsing sequences. I will also demonstrate some results using dynamical decoupling sequences such as Hahn echo, CPMG-n, and XY8-n to characterize the intrinsic spin decoherence times. In the framework of a many-body dipolar spin ensemble, I will present my progress in the study of the non-equilibrium discrete time crystal (DTC) phase subject to a Floquet driving. I will also talk about my plan to further investigate DTC physics with a two-resonance Floquet driving sequence and to implement a two-basis quantum logic protocol toward enhanced quantum sensing and quantum memory. Finally, I will talk about my motivation for Ph.D. research in quantum optics and AMO physics, with a focus on neutral atom quantum computing and simulation.