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Emerging coherence with unified energy, temperature, and lifetime scale in heavy fermion YbRh 2Si 2

  • Author(s): Mo, SK
  • Lee, WS
  • Schmitt, F
  • Chen, YL
  • Lu, DH
  • Capan, C
  • Kim, DJ
  • Fisk, Z
  • Zhang, CQ
  • Hussain, Z
  • Shen, ZX
  • et al.
Abstract

We present ultrahigh resolution angle-resolved photoemission data of the prototypical Kondo lattice system YbRh 2Si 2, using a 7 eV laser photon source. Detailed temperature dependent measurements reveal the development of coherent states, in the form of sharp, weakly dispersing peaks at the lowest energy of single-electron spectra, below a characteristic temperature. The characteristic temperature, obtained from angle-resolved photoemission, is intriguingly of exactly the same scale as the energy and the lifetime of the coherent state. © 2012 American Physical Society.

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