Year: 2023
Type: article
Abstract: The coherent dynamics of a quantum mechanical two-level system passing through an anti-crossing of two energy levels can give rise to Landau-Zener-Stückelberg-Majorana (LZSM) interference. LZSM interference spectroscopy has proven to be a fruitful tool to investigate charge noise and charge decoherence in semiconductor quantum dots (QDs). Recently, bilayer graphene has developed as a promising platform to host highly tunable QDs potentially useful for hosting spin and valley qubits. So far, in this system no coherent oscillations have been observed and little is known about charge noise in this material. Here, we report coherent charge oscillations and [Formula: see text] charge decoherence times in a bilayer graphene double QD. The charge decoherence times are measured independently using LZSM interference and photon assisted tunneling. Both techniques yield [Formula: see text] average values in the range of 400-500 ps. The observation of charge coherence allows to study the origin and spectral distribution of charge noise in future experiments.
Source: Nature Communications
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,290
Awards: G1110416008, G1549117647, G1912282531, G2115222242, G3356704239, G3854390519, G4162329948, G434337789, G4453442172, G4672599647, 2D Materials for Quantum Technology, Graphene Flagship Core Project 3, G6664495284, EXC 2004: Materie und Licht für Quanteninformation (ML4Q), Synthesis of high quality single crystals for sience of Boron Nitride, G898758523
OpenAlex ID: W4389160750