Extreme electron-hole drag and negative mobility in the Dirac plasma of graphene

• DOI: 10.48550/arxiv.2410.10640
• Publication Date: 2024-10-14
• Authors: Л. А. Пономаренко; Alessandro Principi; Andy Niblett; Wendong Wang; Р. В. Горбачев; Piranavan Kumarav...; Alexey I. Berdyugin; А. V. Ermakov; Sergey Slizovskiy; Kenji Watanabe; Takashi Taniguchi; Qi Ge; Vladimir I. Fal’ko; L. Eaves; M. T. Greenaway; A. K. Geim
• Keywords: 0301 basic medicine; Condensed Matter - Materials Science; Condensed Matter - Mesoscale and Nanoscale Physics; Science; Q; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; 530; ResearchInstitutes_Networks_Beacons/national_graphene_institute; name=National Graphene Institute; Article; Condensed Matter - Other Condensed Matter; 03 medical and health sciences; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Other Condensed Matter (cond-mat.other)

Coulomb drag between adjacent electron and hole gases has attracted considerable attention, being studied in various two-dimensional systems, including semiconductor graphene heterostructures. Here we report measurements of electron-hole the Planckian plasma that develops monolayer vicinity its Dirac point above liquid-nitrogen temperatures. The frequent scattering forces minority carriers to move against applied electric field due induced by majority carriers. This unidirectional transport electrons holes results nominally negative mobility for is found be strongest near-room temperature, despite notably affected phonon scattering. Our findings provide better understanding properties charge-neutral graphene, reveal limits on hydrodynamic description also offer insight into quantum-critical systems general.