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Hyperbolicity on-demand in van der Waals Semiconductors

ORAL

Abstract

Strong anisotropy is inherent to natrually layered van der Waals (vdW) materials. Consequentially, dipole active resonances can render the principle values of the dielectric tensor of opposite sign along orthogonal crystallographic directions within naturally occurring vdW materials. Chief among the resultant non-intuitive optical properties is the formation of sub-diffractional wavepackets that travel as conical rays with hyperbolic dispersion throughout their bulk. Here, I discuss our work on producing an on-demand hyperbolic response within the vdW semiconductor WSe2. By utilizing femtosecond photoexcitation to inject electron-hole pairs in WSe2 we dramatically altered its electronic response. Our time-resolved nano-imaging data reveals key signatures of hyperbolicity produced on-demand, which appear on the sub-picosecond timescale.

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Presenters

  • Aaron Sternbach

    Department of Physics, Columbia University, Columbia University, Columbia Univ

Authors

  • Aaron Sternbach

    Department of Physics, Columbia University, Columbia University, Columbia Univ

  • Sang Hoon Chae

    Columbia University

  • Simone Latini

    Max Planck Institute for the Structure and Dynamics of Matter

  • Andrey Rikhter

    UC San Diego, University of California, San Diego

  • Yinming Shao

    Department of Physics, Columbia University, Columbia Univ, Columbia University

  • Baichang Li

    Department of Mechanical Engineering, Columbia University, Columbia University

  • Daniel Rhodes

    Physics, University of Wisconsin - Madison, Physics, Columbia University, Materials Science and Engineering, University of Wisconsin-Madison, University of Wisconsin-Madison

  • Brian Sae Yoon Kim

    Columbia University

  • P. James Schuck

    Mechanical Engineering, Columbia University, Columbia University, Department of Mechanical Engineering, Columbia University

  • Xiaodong Xu

    Physics, University of Washington, Department of Physics, University of Washington, University of Washington, Department of Physics, University of Washington, Seattle, University of Washington, Seattle

  • Xiaoyang Zhu

    Columbia University, Chemistry, Columbia university, Chemistry, Columbia University, Department of Chemistry, Columbia University

  • Richard Averitt

    University of California, San Diego, University of California San Diego, UC San Diego, Physics, University of California San Diego, Department of Physics, University of California, San Diego, University of California

  • James Hone

    Columbia Univ, Columbia University, Department of Mechanical Engineering, Columbia University, Mechanical Engineering, Columbia University

  • Michael Fogler

    University of California, San Diego, Department of Physics, University of California San Diego, UC San Diego, Department of Physics, University of California, San Diego, UCSD, University of California San Diego

  • Angel Rubio

    Max Plank Institute for the Structure and Dynamics of Matter; Center for Computational Quantum Physics Flatiron Institute, Max Planck Institute for the Structure and Dynamics of Matter, Theory, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Inst Structure & Dynamics of Matter, Physics, Max Planck Institute, Max Planck Institute for Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, 22761 Hamburg, Germany, Max Planck Institute for the Structure and Dynamics of Matter and Center Free-Electron Laser Science, Hamburg, Germany, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany, MPSD Hamburg, Max Planck Institute, Max Planck Inst Structure & Dynamics of Matter; Center for Computational Quantum Physics Flatiron Institute, Simons Foundation NY, USA, Theory, Max Planck Inst Structure & Dynamics of Matter

  • Dmitri Basov

    Columbia University, Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ