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Leonardo Degiorgi Laboratorium für Festkörperphysik ETH Zürich, Switzerland

Infrared and Raman study of the charge-density-wave state in the rare-earth polychalcogenides R Te n. Leonardo Degiorgi Laboratorium für Festkörperphysik ETH Zürich, Switzerland. Motivation. ➠ Charge ordering in low dimensions (CDW, stripes, checkerboard)

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Leonardo Degiorgi Laboratorium für Festkörperphysik ETH Zürich, Switzerland

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  1. Infrared and Raman study of the charge-density-wave state in the rare-earth polychalcogenides RTen Leonardo Degiorgi Laboratorium für Festkörperphysik ETH Zürich, Switzerland

  2. Motivation ➠ Charge ordering in low dimensions (CDW, stripes, checkerboard) ➠ Impact of charge ordering on the lattice dynamics ➠ Interplay between electronic and phononic degrees of freedom ➠ Role played by the electron-phonon coupling ➠ Fermi surface instabilities (nesting)

  3. RTe3 RTe2 R2Te5 The Rare-Earth Tellurides RTen (n=2, 2.5 and 3) DiMasi et al., Phys. Rev. B52, 14516 (1995)

  4. Kramers-Kronig 1() (cm)-1 Photon Energy (eV) Photon Energy (eV) Reflectivity and Optical Conductivity http://www.solidphys.ethz.ch/spectro/

  5. Optical Reflectivity of RTe3 Sacchetti et al., Phys. Rev. B74, 125115 (2006)

  6. Plasma Frequency and Single Particle Peak in RTe3 Sacchetti et al., Phys. Rev. B74, 125115 (2006)

  7. Pressure Dependence of R() in CeTe3

  8. X-ray experiment at ESRF CDW Gap: Applied versus Chemical Pressure Dependence Sacchetti et al., Phys. Rev. Lett. 98, 026401 (2007)

  9. Ek ħω ħω’ E2 E1 ħω ħω’ E2 E1 Stokes Anti-Stokes Raman Scattering

  10. Raman Scattering in RTe3:Chemical versus Applied Pressure

  11. Order Parameter versus Integrated Intensity of the Raman Modes in RTe3 Petzelt and Dvorak, J. Phys. C9, 1571 (1976)

  12. Conclusions and Future Outlook Tomonaga-Luttinger Liquid Phonon Dispersion and Kohn Anomaly Equivalence between Chemical and Applied Pressure Fermi Surface Gapping

  13. Lavagnini Pfuner Sacchetti Acknowledgements Experiment A. Perucchi E. Arcangeletti L. Baldassarre M. Baldini D. Di Castro P. Postorino S. Lupi (University La Sapienza Rome and ELETTRA Trieste) Samples I.R. Fisher N. Ru Y.K. Shin J.-H. Chu (Stanford University) Theory T. Giamarchi (University of Geneva) R. Monnier (ETH Zurich) B. Delley (PSI)

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