Mesoscopic Klein-Schwinger effect in graphene - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail (Preprint/Prepublication) Année : 2022

Mesoscopic Klein-Schwinger effect in graphene

Takashi Taniguchi
  • Fonction : Auteur
  • PersonId : 1027334
Kanji Watanabe
  • Fonction : Auteur
  • PersonId : 1051334
Jérôme Cayssol
  • Fonction : Auteur
  • PersonId : 905595

Résumé

Strong electric field annihilation by particle-antiparticle pair creation, described in detail by Sauter and Schwinger, is a basic non-perturbative prediction of quantum electrodynamics. Its experimental demonstration remains elusive as Schwinger fields E S are beyond reach even for the light electron-positron pairs. Here we put forward a mesoscopic variant of the Schwinger effect in graphene, which hosts Dirac fermions with electron-hole symmetry. Using DC transport and RF noise, we report on universal 1d-Schwinger conductance at the pinch-off of ballistic graphene transistors. Strong pinch-off electric fields are concentrated in a length Λ > ∼ 0.1 µm at the transistor drain, and induce Schwinger e-h pair creation at saturation, for a Schwinger voltage V S = E S Λ on the order of the pinch-off voltage. This Klein-Schwinger effect (KSE) precedes an instability toward an ohmic Zener regime, which is rejected at twice the pinch-off voltage in long devices. The KSE not only gives clues to current saturation limits in ballistic graphene, but also opens new routes for quantum electrodynamic experiments in the laboratory.
Fichier principal
Vignette du fichier
2207.13400(5).pdf (3.98 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04035853 , version 1 (15-11-2022)
hal-04035853 , version 2 (16-05-2023)

Identifiants

  • HAL Id : hal-04035853 , version 1

Citer

Aurélien Schmitt, Pierre Vallet, Michael Rosticher, Takashi Taniguchi, Kanji Watanabe, et al.. Mesoscopic Klein-Schwinger effect in graphene. 2022. ⟨hal-04035853v1⟩
136 Consultations
47 Téléchargements

Partager

Gmail Facebook X LinkedIn More