ICTS:29120

Video URL

CT- Minimally viscous electron fluid in ultraclean graphene

CT- Minimally viscous electron fluid in ultraclean graphene

(2024). CT- Minimally viscous electron fluid in ultraclean graphene. SciVideos. https://youtube.com/live/wyeypJJAWDw

CT- Minimally viscous electron fluid in ultraclean graphene. SciVideos, Jul. 15, 2024, https://youtube.com/live/wyeypJJAWDw 

          @misc{ scivideos_ICTS:29120,
            doi = {},
            url = {https://youtube.com/live/wyeypJJAWDw},
            author = {},
            keywords = {},
            language = {en},
            title = {CT- Minimally viscous electron fluid in ultraclean graphene},
            publisher = {},
            year = {2024},
            month = {jul},
            note = {ICTS:29120 see, \url{https://scivideos.org/icts-tifr/29120}}
          }
Aniket Majumdar
Talk numberICTS:29120
Source RepositoryICTS-TIFR
Source EventEngineered 2D Quantum Materials
Collection

Abstract

Hydrodynamic flow of electrons in graphene has garnered significant attention over the past decade, emerging as a solid-state platform which can be used to probe the physics associated with relativistic plasma, black holes, and quantum gravity [1,2]. Particularly near the charge neutrality point, graphene is expected to behave like a “Dirac fluid” [3], with its shear viscosity per unit entropy density (η/s) reaching a universal holographic lower bound, ħ/4πk_B where ħ is the reduced Planck’s constant and kB is the Boltzmann’s constant. However, direct experimental evidence of this is still lacking. In this work [4], we have fabricated hBN-encapsulated ultraclean graphene devices with exceptionally high electron mobilities (~ 10^6 cm^2 V^-1 s^-1) and performed electrical and thermal transport from room temperature down to 20 K. We observed a giant violation of the Wiedemann-Franz Law near the charge neutrality point across a range of temperatures T >> T_F. We also computed t...