2012/03/31 by A. C. Betz, Fabien Vialla, F. Vialla +17 · 7 citations
Engineering · Materials Science · Physics and Astronomy · #Atomic physics #Bolometer #Condensed matter physics #Detector #Electron #Graphene #Graphene research and applications #Helium #Liquid helium #Materials science #Nanotechnology #Optics #Phonon #Physics #Quantum mechanics #Thermal Radiation and Cooling Technologies #Thermal properties of materials #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.109.056805
published as Phys. Rev. Lett. 109, 056805 (2012) · 5 figures
openalex publication_date 2012/08/02 · arxiv created 2012/08/11 · arxiv updated 2012/08/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have investigated the energy loss of hot electrons in metallic graphene by means of GHz noise thermometry at liquid helium temperature. We observe the electronic temperature T ∝ V at low bias in agreement with the heat diffusion to the leads described by the Wiedemann-Franz law. We report on T ∝ √V behavior at high bias, which corresponds to a T(4) dependence of the cooling power. This is the signature of a 2D acoustic phonon cooling mechanism. From a heat equation analysis of the two regimes we extract accurate values of the electron-acoustic phonon coupling constant Σ in monolayer graphene. Our measurements point to an important effect of lattice disorder in the reduction of Σ, not yet considered by theory. Moreover, our study provides a strong and firm support to the rising field of graphene bolometric detectors.