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  Phonon Driven Floquet Matter

Hübener, H., de Giovannini, U., & Rubio, A. (2018). Phonon Driven Floquet Matter. Nano Letters, 18(2), 1535-1542. doi:10.1021/acs.nanolett.7b05391.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-A9CD-A Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A4C8-2
Genre: Journal Article

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 Creators:
Hübener, H.1, 2, Author              
de Giovannini, U.1, 2, Author              
Rubio, A.1, 2, 3, Author              
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Free-Electron Laser Science and Department of Physics, University of Hamburg, ou_persistent22              
3Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              

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Free keywords: First-principles calculations, photoelectron spectroscopy, nonequilibrium bandstructure, pumpprobe spectroscopy, Floquet theory, electron−phonon coupling
 Abstract: The effect of electron–phonon coupling in materials can be interpreted as a dressing of the electronic structure by the lattice vibration, leading to vibrational replicas and hybridization of electronic states. In solids, a resonantly excited coherent phonon leads to a periodic oscillation of the atomic lattice in a crystal structure bringing the material into a nonequilibrium electronic configuration. Periodically oscillating quantum systems can be understood in terms of Floquet theory, which has a long tradition in the study of semiclassical light-matter interaction. Here, we show that the concepts of Floquet analysis can be applied to coherent lattice vibrations. This coupling leads to phonon-dressed quasi-particles imprinting specific signatures in the spectrum of the electronic structure. Such dressed electronic states can be detected by time- and angular-resolved photoelectron spectroscopy (ARPES) manifesting as sidebands to the equilibrium band structure. Taking graphene as a paradigmatic material with strong electron–phonon interaction and nontrivial topology, we show how the phonon-dressed states display an intricate sideband structure revealing the electron–phonon coupling at the Brillouin zone center and topological ordering of the Dirac bands. We demonstrate that if time-reversal symmetry is broken by the coherent lattice perturbations a topological phase transition can be induced. This work establishes that the recently demonstrated concept of light-induced nonequilibrium Floquet phases can also be applied when using coherent phonon modes for the dynamical control of material properties.

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Language(s): eng - English
 Dates: 2018-01-232017-12-222018-01-232018-02
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.nanolett.7b05391
arXiv: 1801.00599
 Degree: -

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Project name : We are grateful for illuminating discussions with I. Gierz, S. Aeschlimann, M. A. Sentef, and Th. Brumme. We acknowledge financial support from the European Research Council (ERC-2015-AdG-694097), Grupos Consolidados (IT578-13), and the European Unions Horizon 2020 Research and Innovation program under Grant Agreements 676580 (NOMAD) and 646259 (MOSTOPHOS).
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 18 (2) Sequence Number: - Start / End Page: 1535 - 1542 Identifier: ISSN: 1530-6984
CoNE: /journals/resource/110978984570403