Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 38: Transport: Quantum Coherence and Quantum Information Systems - Experiment (jointly with MA, HL)
TT 38.10: Talk
Wednesday, March 22, 2017, 12:00–12:15, HSZ 03
A pulsed electron paramagnetic resonance spectrometer operating at millikelvin temperatures — •Stefan Weichselbaumer1,2, Christoph W. Zollitsch1,2, Kai Müller1,2, Petio Natzkin1,2, Sebastian T. B. Goennenwein1,2,3, Martin S. Brandt2,4, Rudolf Gross1,2,5, and Hans Huebl1,2,5 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany — 3Institut für Festkörperphysik, Technische Universität Dresden, Dresden, Germany — 4Walter Schottky Institut, Technische Universität München, Garching, Germany — 5Nanosystems Initiative Munich, Munich, Germany
Electron paramagnetic resonance (EPR) is an ubiquitous spectroscopy tool which is employed in many areas of research. One critical aspect for any application is the sensitivity of the spectrometer which scales with the degree of spin polarization in the sample. In the paramagnetic case, this spin polarization is determined by the ratio of magnetic field and temperature, B/T. Here, we report on the implementation of a pulsed EPR spectrometer using superconducting microwave resonators, operating at millikelvin temperatures. We investigate a spin ensemble of phosphorus donors embedded in an isotopically purified nuclear spin free 28Si environment, which exhibits a thermal spin polarization close to unity at 50 mK. Our high sensitivity allows for single-shot measurements with an exceptional signal-to-noise ratio SNR≫ 1 for approximately 108 spins.
This work was supported by the DFG via SPP 1601 (HU1861/2-1).