Hyperbolic cooling of graphene Zener-Klein transistors Transport PLUS Noise thermometry W. Yang, S. Berthou, X. Lu, Q. Wilmart, A. Denis, M. Rosticher, T. Taniguchi, K. Watanabe, G. Fève, J.M. Berroir, G. Zhang, C. Voisin, E. Baudin, and B. Plaçais Drain Source Gate h-BN Hyperbolic cooling
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Hyperbolic cooling of graphene Zener-Klein transistors
Transport PLUS Noise thermometry
W. Yang, S. Berthou, X. Lu, Q. Wilmart, A. Denis, M. Rosticher, T. Taniguchi, K.
Watanabe, G. Fève, J.M. Berroir, G. Zhang, C. Voisin, E. Baudin, and B. Plaçais
Drain
Source
Gateh-BN
Hyperbolic cooling
Noise thermometry brings new information
on scattering and relaxation of graphene carriers.
Current saturation regime is investigated here
Graphene 2017, opto-electronics
Introduction
Graphene 2017, opto-electronics
Hyberbolic Phonon Polaritons of uniaxial hBN
𝜖𝑚 = 𝜖∞,𝑚 + 𝜖∞,𝑚 ×𝜔𝐿𝑂,𝑚
2− 𝜔𝑇𝑂,𝑚
2
𝜔𝑇𝑂,𝑚2−𝜔2 − 𝑖𝜔Γ𝑚
𝑘𝑥2
𝜖⫠+𝑘𝑧2
𝜖||=𝜔2
𝑐2
𝜖⊥ < 0, 𝜖∥ > 0
𝑒𝑖(𝑘𝑥𝑥−Ω𝑡) × 𝑒𝑖(𝑘𝑧𝑧)
Dai et al. Nat. Nano. 2015 Kumar et al., Nano Letters 2015Caldwell et al. Nat Comm. 2014 ; Brar et al., Nano Letters 2014 ; …..
Graphene 2017, opto-electronics
Propagating HPPs
HPPs and hot graphene ?
SLG, BLG, TLGLxW=4x3 µmSource Drain
Gate
2D h-BN HPPs
Near field coupling of graphene hot electrons with substrate phonons
Graphene on 3D oxide Graphene on 2D h-BN
heat diffusion to the gate heat propagation to the gate
SLG, BLG, TLGLxW=4x3 µmSource Drain
Gate
SiO2, Al2O3, HfO2, … SPPs
Graphene 2017, opto-electronics
Graphene current fluctuations
emit HPP radiations deep into
hBN bulk
Klein Tunneling across n-p-n barriers Electric field induced Zener tunneling
zero bandgap semiconducitor
Angular-dependent transmission
Klien and Zener Tunneling
Graphene 2017, opto-electronics
SLG BLG
Katsnelson, Novoselov, Geim, Nat. Phys.2, 620 (2006) Kane et al., J. Phys. : Condens. Matter 27 (2015)