Two-Phonon Quantum Coherences in Indium Antimonide Studied by Nonlinear Two-Dimensional Terahertz Spectroscopy

Carmine Somma, Giulia Folpini, Klaus Reimann, Michael Woerner, and Thomas Elsaesser
Phys. Rev. Lett. 116, 177401 – Published 28 April 2016

Abstract

We report the first observation of two-phonon quantum coherences in a semiconductor. Two-dimensional terahertz (THz) spectra recorded with a sequence of three THz pulses display strong two-phonon signals, clearly distinguished from signals due to interband two-photon absorption and electron tunneling. The two-phonon coherences originate from impulsive off-resonant excitation in the nonperturbative regime of light-matter interaction. A theoretical analysis provides the relevant Liouville pathways, showing that nonlinear interactions using the large interband dipole moment generate stronger two-phonon excitations than linear interactions.

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  • Received 25 January 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.177401

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalNonlinear DynamicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Carmine Somma, Giulia Folpini, Klaus Reimann, Michael Woerner*, and Thomas Elsaesser

  • Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany

  • *woerner@mbi-berlin.de

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Issue

Vol. 116, Iss. 17 — 29 April 2016

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