High-Resolution Valley Spectroscopy of Si Quantum Dots

2017/04/20 by Xiao Mi, X. Mi, Csaba G. Péterfalvi +3 · 3 citations
Physics and Astronomy · #Atomic physics #Condensed matter physics #Dipole #Electrical engineering #Electron #Materials science #Microwave #Photon #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor Quantum Structures and Devices #Spectroscopy #Superconductivity #Transmission (telecommunications) #cond-mat.mes-hall #quant-ph

paper · pdf · doi:10.1103/physrevlett.119.176803

published as Phys. Rev. Lett. 119, 176803 (2017)

arxiv created 2017/04/20 · openalex publication_date 2017/10/24 · arxiv updated 2017/10/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

Citations

• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Dipole coupling of a double quantum dot to a microwave resonator
• Circuit quantum electrodynamics with a spin qubit
• Single-shot read-out of an individual electron spin in a quantum dot

Cited by

• Spin-Blockade Spectroscopy of Si/Si-Ge Quantum Dots
• Magnetic-Gradient-Free Two-Axis Control of a Valley Spin Qubit in SixGe1−x
• Superconductor–semiconductor hybrid-circuit quantum electrodynamics
• Valley Splitting Correlations Across a Silicon Quantum Well Containing Germanium