Photoinduced Persistent Electron Accumulation and Depletion in LaAlO 3 / SrTiO 3 Quantum Wells - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2020

Photoinduced Persistent Electron Accumulation and Depletion in LaAlO 3 / SrTiO 3 Quantum Wells

Résumé

Persistent photoconductance is a phenomenon found in many semiconductors, by which light induces long-lived excitations in electronic states. Commonly, persistent photoexcitation leads to an increase of carriers (accumulation), though occasionally it can be negative (depletion). Here, we present the quantum well at the LaAlO3/SrTiO3 interface, where in addition to photoinduced accumulation, a secondary photoexcitation enables carrier depletion. The balance between both processes is wavelength dependent, and allows tunable accumulation or depletion in an asymmetric manner, depending on the relative arrival time of photons of different frequencies. We use Green’s function formalism to describe this unconventional photoexcitation, which paves the way to an optical implementation of neurobiologically inspired spike-timing-dependent plasticity.
Fichier principal
Vignette du fichier
2020_Phys_Rev_Lett_124_246804_Chen.pdf (1.89 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-02906097 , version 1 (04-01-2021)

Identifiants

Citer

Yu Chen, Yoann Lechaux, Blai C Casals, Bruno Guillet, Albert Minj, et al.. Photoinduced Persistent Electron Accumulation and Depletion in LaAlO 3 / SrTiO 3 Quantum Wells. Physical Review Letters, 2020, 124 (24), ⟨10.1103/physrevlett.124.246804⟩. ⟨hal-02906097⟩
40 Consultations
38 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More