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Femtosecond exciton dynamics in WSe2 optical waveguides.
Sternbach, Aaron J; Latini, Simone; Chae, Sanghoon; Hübener, Hannes; De Giovannini, Umberto; Shao, Yinming; Xiong, Lin; Sun, Zhiyuan; Shi, Norman; Kissin, Peter; Ni, Guang-Xin; Rhodes, Daniel; Kim, Brian; Yu, Nanfang; Millis, Andrew J; Fogler, Michael M; Schuck, Peter J; Lipson, Michal; Zhu, X-Y; Hone, James; Averitt, Richard D; Rubio, Angel; Basov, D N.
Afiliação
  • Sternbach AJ; Department of Physics, Columbia University, New York, NY, 10027, USA. as5049@columbia.edu.
  • Latini S; Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761, Hamburg, Germany.
  • Chae S; Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA.
  • Hübener H; Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761, Hamburg, Germany.
  • De Giovannini U; Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761, Hamburg, Germany.
  • Shao Y; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Xiong L; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Sun Z; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Shi N; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Kissin P; Department of Physics, University of California, San Diego, La Jolla, 92093, CA, USA.
  • Ni GX; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Rhodes D; Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA.
  • Kim B; Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA.
  • Yu N; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Millis AJ; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Fogler MM; Department of Physics, University of California, San Diego, La Jolla, 92093, CA, USA.
  • Schuck PJ; Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA.
  • Lipson M; Department of Electrical Engineering, Columbia University, New York, NY, 10027, USA.
  • Zhu XY; Department of Chemistry, Columbia University, New York, NY, 10027, USA.
  • Hone J; Department of Mechanical Engineering, Columbia University, New York, NY, 10027, USA.
  • Averitt RD; Department of Physics, University of California, San Diego, La Jolla, 92093, CA, USA.
  • Rubio A; Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761, Hamburg, Germany.
  • Basov DN; Center for Computational Quantum Physics (CCQ), Flatiron Institute, 162 Fifth Avenue, New York, NY, 10010, USA.
Nat Commun ; 11(1): 3567, 2020 Jul 16.
Article em En | MEDLINE | ID: mdl-32678086
Van-der Waals (vdW) atomically layered crystals can act as optical waveguides over a broad range of the electromagnetic spectrum ranging from Terahertz to visible. Unlike common Si-based waveguides, vdW semiconductors host strong excitonic resonances that may be controlled using non-thermal stimuli including electrostatic gating and photoexcitation. Here, we utilize waveguide modes to examine photo-induced changes of excitons in the prototypical vdW semiconductor, WSe2, prompted by femtosecond light pulses. Using time-resolved scanning near-field optical microscopy we visualize the electric field profiles of waveguide modes in real space and time and extract the temporal evolution of the optical constants following femtosecond photoexcitation. By monitoring the phase velocity of the waveguide modes, we detect incoherent A-exciton bleaching along with a coherent optical Stark shift in WSe2.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Commun Assunto da revista: BIOLOGIA / CIENCIA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Estados Unidos
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Commun Assunto da revista: BIOLOGIA / CIENCIA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Estados Unidos