2024/05/15 by S. O. Potashin, L. E. Golub, Potashin, S. O. +3 · 1 citation
Engineering · #FOS: Physical sciences #Lattice Boltzmann Simulation Studies #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · pdf · doi:10.48550/arxiv.2405.09668
openalex publication_date 2024/05/15 · openalex created_date 2024/05/18 · openalex updated_date 2026/07/28
We study thermoelectric and viscous contributions to the ratchet effect, i.e. radiation-induced generation of the direct electric current, J\rm rat, in asymmetric dual-grating gate structure without inversion center. Previously [E.Mönch et al, Phys. Rev. B \bf 105, 045404 (2022)], it was demonstrated that frequency dependence of the J\rm rat is essentially different within hydrodynamic (HD) and drift-diffusion (DD) regimes of the electron transport: J\rm rat\rm HD ∝ 1/ω6 and J\rm rat\rm DD ∝ 1/ω2 for ω→ ∞. Here we analyze previously neglected thermoelectric contribution and find that it yields high-frequency asymptotic 1/ω2 even in the HD regime and can change sign of the response. Account of the finite viscosity of the electron liquid yields contribution which scales at high frequency as 1/ω4. We also find plasmonic resonances in the J\rm rat, and demonstrate that asymmetry of the structure allows for excitation of the so-called directional travelling plasmons.