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Coherent Rabi dynamics of a superradiant spin ensemble in a microwave cavity

Author(s): Rose, BC; Tyryshkin, AM; Riemann, H; Abrosimov, NV; Becker, P; et al

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Abstract: We achieve the strong-coupling regime between an ensemble of phosphorus donor spins in a highly enriched 28Si crystal and a 3D dielectric resonator. Spins are polarized beyond Boltzmann equilibrium using spin-selective optical excitation of the no-phonon bound exciton transition resulting in N = 3.6 × 1013 unpaired spins in the ensemble. We observe a normal mode splitting of the spin-ensemble-cavity polariton resonances of 2g √ N = 580 kHz (where each spin is coupled with strength g) in a cavity with a quality factor of 75 000 (γ ≪ κ ≈ 60 kHz, where γ and κ are the spin dephasing and cavity loss rates, respectively). The spin ensemble has a long dephasing time (T* 2 = 9 μs) providing a wide window for viewing the dynamics of the coupled spin-ensemble-cavity system. The free-induction decay shows up to a dozen collapses and revivals revealing a coherent exchange of excitations between the superradiant state of the spin ensemble and the cavity at the rate g √ N. The ensemble is found to evolve as a single large pseudospin according to the Tavis-Cummings model due to minimal inhomogeneous broadening and uniform spin-cavity coupling. We demonstrate independent control of the total spin and the initial Z projection of the psuedospin using optical excitation and microwave manipulation, respectively. We vary the microwave excitation power to rotate the pseudospin on the Bloch sphere and observe a long delay in the onset of the superradiant emission as the pseudospin approaches full inversion. This delay is accompanied by an abrupt p-phase shift in the peusdospin microwave emission. The scaling of this delay with the initial angle and the sudden phase shift are explained by the Tavis-Cummings model.
Publication Date: 10-Jul-2017
Electronic Publication Date: 10-Jul-2017
Citation: Rose, BC, Tyryshkin, AM, Riemann, H, Abrosimov, NV, Becker, P, Pohl, H-J, Thewalt, MLW, Itoh, KM, Lyon, SA. (2017). Coherent Rabi dynamics of a superradiant spin ensemble in a microwave cavity. Physical Review X, 7 (10.1103/PhysRevX.7.031002
DOI: doi:10.1103/PhysRevX.7.031002
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review X
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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