Ultrafast Photoluminescence from Graphene

Chun Hung Lui (呂振鴻), Kin Fai Mak, Jie Shan, and Tony F. Heinz
Phys. Rev. Lett. 105, 127404 – Published 16 September 2010
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Abstract

Since graphene has no band gap, photoluminescence is not expected from relaxed charge carriers. We have, however, observed significant light emission from graphene under excitation by ultrashort (30-fs) laser pulses. Light emission was found to occur across the visible spectral range (1.7–3.5 eV), with emitted photon energies exceeding that of the excitation laser (1.5 eV). The emission exhibits a nonlinear dependence on the laser fluence. In two-pulse correlation measurements, a dominant relaxation time of tens of femtoseconds is observed. A two-temperature model describing the electrons and their interaction with strongly coupled optical phonons can account for the experimental observations.

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  • Received 27 March 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.127404

© 2010 The American Physical Society

Authors & Affiliations

Chun Hung Lui (呂振鴻)1, Kin Fai Mak1, Jie Shan2, and Tony F. Heinz1,*

  • 1Departments of Physics and Electrical Engineering, Columbia University, 538 West 120th Street, New York, New York 10027, USA
  • 2Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA

  • *Corresponding author: tony.heinz@columbia.edu

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Issue

Vol. 105, Iss. 12 — 17 September 2010

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Heating up of Superconductors
January 27, 2017

This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

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