題目:Fermionic analogue of black hole radiation with a high Hawking temperature
主講人: Feng Liu（Prof.）
主持人: Xiaobin Niu（Prof.）
時 間: 2019年1月27日（周日），10點30分
地 點: 沙河校區通信樓818會議室
Feng Liu, Professor and Chair, Department of Materials Science and Engineering, Adjunct professor, Department of Physics, University of Utah. He received his PhD in Chemical Physics from Virginia Commonwealth University in 1990. Prof. Liu is a fellow of APS and recipient of Senior Humboldt Award. His research interest lies in theoretical and computational studies of low-dimensional nano and quantum materials, with a most recent focus on topological physics and materials.
Measurement of gravitational Hawking radiation of black hole (BH) is prohibitive because of an extremely low Hawking temperature (TH). Efforts have been devoted to creating artificial BHs with a higher TH but having rather limited success. In this talk, I will discuss our recent theoretical studies demonstrating a fermionic analog of BH with a high TH ~ 3 K. We show that Floquet-Dirac states, formed in a periodically laser driven black phosphorous thin film, can be designed with a spatial field gradient to mimic the “gravity” felt by fermionic quasiparticles as that for a Schwarzschild BH (SBH). Quantum tunneling of electrons from a type-II Dirac cone (inside BH) to a type-I Dirac cone (outside) through the region of type-III Dirac states (event horizon) emits a SBH-like Hawking radiation spectrum. This work provides a laboratory design of fermionic BH and a condensed-matter analogue to study fascinating astrophysical phenomena.