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Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars. 
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Phonon Driven Floquet Matter.

Hannes Hübener1,2, Umberto De Giovannini1,2, Angel Rubio1,2,3

  • 1Max Planck Institute for the Structure and Dynamics of Matter , Luruper Chaussee 149, 22761 Hamburg, Germany.

Nano Letters
|January 24, 2018
PubMed
Summary
This summary is machine-generated.

Floquet theory concepts can now describe coherent lattice vibrations, creating phonon-dressed quasiparticles. This reveals electron-phonon coupling and can induce topological phase transitions in materials like graphene.

Keywords:
First-principles calculationsFloquet theoryelectron−phonon couplingnonequilibrium bandstructurephotoelectron spectroscopypumpprobe spectroscopy

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Spectroscopy

Background:

  • Electron-phonon coupling modifies electronic structure via lattice vibrations.
  • Coherent phonons induce nonequilibrium electronic states in solids.
  • Floquet theory analyzes periodically driven quantum systems.

Purpose of the Study:

  • Apply Floquet analysis to coherent lattice vibrations.
  • Investigate phonon-dressed quasiparticles and their spectral signatures.
  • Explore topological phase transitions induced by lattice perturbations.

Main Methods:

  • Theoretical application of Floquet analysis to lattice vibrations.
  • Time- and angular-resolved photoelectron spectroscopy (ARPES) for detecting dressed states.
  • Graphene as a model system for electron-phonon coupling and topology.

Main Results:

  • Phonon-dressed quasiparticles exhibit unique spectral sidebands.
  • Revealed electron-phonon coupling at the Brillouin zone center in graphene.
  • Demonstrated induction of topological phase transitions by breaking time-reversal symmetry.

Conclusions:

  • Floquet theory is applicable to coherent lattice vibrations.
  • Phonon-dressed states provide insights into electron-phonon coupling and topology.
  • Coherent phonons offer a route for dynamical control of material properties and topological phases.