R. G. Herb Condensed Matter Seminar

Spectroscopy with Josephson Junctions

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Date: Tuesday, October 8th

Time: 11:00 am

Place: 4274 Chamberlin Hall

Speaker: Dr. Çaglar Girit, College de France

Abstract: Spectroscopy, by providing a direct measurement of the energy spectrum, is a powerful tool to probe matter. Conventional spectroscopy techniques suffer several drawbacks when applied to mesoscopic systems, or artificial quantum coherent atoms. I present an on-chip, Josephson-junction based spectrometer which surpasses state-of-the-art instruments, works between 2-200 GHz, and is ideally suited for probing elementary excitations in mesoscopic systems. I describe the operating principle and design of the spectrometer, show spectra of several superconducting quantum circuits, and outline experiments to investigate single quasiparticles in superconductors.

Host: Brar

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