,Fermionic Analogue of High Temperature Hawking Radiation in Black Phosphorus

• 作 者: Hang Liu Jia-Tao Sun Chenchen Song Huaqing Huang Feng Liu Sheng Meng
• 机 构: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy o
• 出 处: 中国物理快报（英文版）
• 发表日期: 2020年6期

Time-periodic laser driving can create nonequilibrium states not accessible in equilibrium,opening new regimes in materials engineering and topological phase transitions.We report that black phosphorus (BP) exhibits spatially nonuniform topological Floquet-Dirac states under laser illumination,mimicking the "gravity" felt by fermionic quasiparticles in the same way as that for a Schwarzschild black hole (SBH).Quantum tunneling of electrons from a type-Ⅱ Dirac cone (inside BH) to a type-I Dirac cone (outside BH) emits an SBH-like Planck radiation spectrum.The Hawking temperature TH obtained for a fermionic analog of BH in the bilayer BP is approximately 3 K,which is several orders of magnitude higher than that in previous works.Our work sheds light on increasing TH from the perspective of engineering 2D materials by time-periodic light illumination.The predicted SBH-like Hawking radiation,accessible in BP thin films,provides clues to probe analogous astrophysical phenomena in solids.