High-Resolution Valley Spectroscopy of Si Quantum Dots

X. Mi, Csaba G. Péterfalvi, Guido Burkard, J. R. Petta

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

We study an accumulation mode Si/SiGe double quantum dot (DQD) containing a single electron that is dipole coupled to microwave photons in a superconducting cavity. Measurements of the cavity transmission reveal dispersive features due to the DQD valley states in Si. The occupation of the valley states can be increased by raising the temperature or applying a finite source-drain bias across the DQD, resulting in an increased signal. Using the cavity input-output theory and a four-level model of the DQD, it is possible to efficiently extract valley splittings and the inter- and intravalley tunnel couplings.

Original languageEnglish (US)
Article number176803
JournalPhysical review letters
Volume119
Issue number17
DOIs
StatePublished - Oct 24 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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