Year: 2025
Type: article
Abstract: Through analytic derivation within the nonequilibrium Green’s function (NEGF) formalism, we present a comprehensive study of a quantum-coherent single-electron emitter. This emitter is based on a quantum RC circuit driven by periodic square-wave potentials with temporal period T and angular frequency ω=2π/T. Our theoretical results reveal three key characteristics of the single-electron emitter: (i) the characteristic time α of the exponentially decaying current J(t)(∝e−t/α) matches the intrinsic coherence time τ of the quantum dot; (ii) the Fourier spectrum of the current J(mω) carries information of both external driving amplitude U and internal energy levels ϵd of the quantum dot; (iii) the quantization of fundamental Fourier component |J1|=2ef (f=1/T) accompanies the half-quantized relaxation resistance Rq=h/(2e2), featuring quantized dynamics in AC transport through the single-electron emitter. These findings offers new perspectives into the dynamic properties of quantum-coherent AC transport.
Source: Frontiers of Physics
Authors: Jingjing Cheng, Jiayan Zhang, Fuming Xu, Yanxia Xing
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G4423593411, G7971303075
OpenAlex ID: W7087702533
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