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TT: Fachverband Tiefe Temperaturen
TT 79: Superconductivity: Superconducting Electronics - Circuit QED
TT 79.4: Talk
Thursday, March 15, 2018, 10:15–10:30, H 2053
Echo trains in pulsed electron spin resonance — •Stefan Weichselbaumer1,2, Petio Natzkin1,2, Christoph W. Zollitsch1,2, Martin S. Brandt2,3, Rudolf Gross1,2,4, and Hans Huebl1,2,4 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Walter Schottky Institut, Technische Universität München, Garching, Germany — 4Nanosystems Initiative Munich, Munich, Germany
Strong coupling between a spin ensemble and a microwave resonator is essential for a coherent exchange of excitation. While today experiments mostly focus on continuous wave experiments, we investigate the dynamics of the coupled spin-resonator system in the strong coupling regime by pulsed ESR measurements. In particular, we use Hahn echos and observe multiple unexpected echo signatures after the first conventional echo. Experimentally, we study an ensemble of phosphorus donor spins in isotopically purified 28Si with ms coherence times. With a static magnetic field, we tune their transition frequency into resonance with a superconducting lumped element microwave resonator. We present experimental data within and outside the strong coupling regime and discuss a model predicting and corroborating the amplitude evolution of the echos based on the echo separation time, the dephasing rate of the spin ensemble, and the linewidth of the microwave resonator.
We acknowledge financial support from the DFG via SPP 1601.