Black and white hole horizons in Weyl semimetals

MPSD Seminar

  • Date: Nov 17, 2021
  • Time: 11:00 - 12:00
  • Speaker: Daniel Sabsovich
  • Tel Aviv University
  • Location: SR I/II/III and online via Zoom
  • Host: Philip Moll
Black and white hole horizons in Weyl semimetals
Abstract:
Black holes are extraordinary theoretical and astronomical objects which intrigued physicists for the last decade. One of the unique aspects of black holes is Hawking radiation, the emission of radiation with a black body spectrum and an effective temperature, leading to the black hole’s evaporation. As Hawking radiation is not astronomically accessible, currents effort to measure the effect evolve around analogue black or white hole horizons. Recent works suggested a connection between the space-time metric of black holes and the low energy Hamiltonian of Weyl semimetals, such that spatially inhomogeneously tilted Weyl semimetals can be engineered as analog systems. While the mathematical relation was discussed in previous works, it focused on a low energy description of Weyl semimetals, and a deeper understanding of the role of the lattice is missing. As a result, there is no current understating how the Hawking radiation effect materializes in these systems and how it can be experimentally measured. In this talk, we describe the current state of affairs and present our new results. In our work, we investigate the suggested system on a lattice model and find that including the lattice effects, mainly the doubler states which appear in the type II regime, are crucial for detecting Hawking radiation-related signatures. We use a scattering matrix approach to show how specific transmission probabilities through the generated horizon follow the emission rate of Hawking radiation, first for a simplified 1D model and then for a full 3D Weyl semimetal model, and we show how a wave-packet scattering experiment through the horizon can be a probe to detect this signature. Finally, we discuss the possibility to engineer such systems in different material realizations.

Bio:
Daniel Sabsovich is finishing his PhD studies in the condensed matter department in Tel Aviv University under the supervision of Prof. Roni Ilan, where he worked on the subject of Topological semimetals. He did his Masters degree in the field of Astrophysics, in the Weizmann institute of Science, and his undergraduate studies in the Hebrew university of Jerusalem.
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