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Lasing with Topological Weyl Semimetal.

Güneş Oktay1, Mustafa Sarısaman2, Murat Tas3

  • 1Department of Physics, Istanbul University, 34134, Vezneciler, Istanbul, Turkey.

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Researchers explored lasing in topological Weyl semimetals (TWS), revealing two distinct lasing modes due to birefringence. This work paves the way for novel topological lasers and perfect absorbers.

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Area of Science:

  • Condensed Matter Physics
  • Topological Materials Science
  • Quantum Optics

Background:

  • Topological Weyl semimetals (TWS) exhibit unique electronic properties due to their band structure.
  • Investigating lasing phenomena in TWS can unlock new photonic functionalities.

Purpose of the Study:

  • To investigate the lasing behavior of optically active planar topological Weyl semimetals (TWS).
  • To explore the role of Kerr and Faraday rotations in TWS lasing.
  • To demonstrate the potential for creating novel topological lasers and coherent perfect absorbers.

Main Methods:

  • Analysis of Maxwell equations with topological terms on TWS surfaces.
  • Construction of a transfer matrix with 2x2 matrix-valued components.
  • Investigation of effective refractive indices leading to birefringence.
  • Examination of gain values at the lasing threshold.

Main Results:

  • Demonstration of two distinct lasing modes arising from birefringence in TWS.
  • Identification of quantized behavior in gain values at the lasing threshold, attributed to the topological nature of the system.
  • Characterization of TWS laser properties through reflection and transmission amplitudes.

Conclusions:

  • The study reveals robust topological character in TWS through Weyl nodes and surface conductivities.
  • The findings provide a pathway for designing and realizing TWS lasers and coherent perfect absorbers.
  • The quantized gain behavior highlights the unique topological effects in TWS laser systems.