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UID:DSC-13357
DTSTART;TZID=Europe/Berlin:20170925T150000
SEQUENCE:1506326459
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20170925T160000
URL:https://dresden-science-calendar.de/calendar/de/detail/13357
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Watson: The effects of nematic order on the electronic structure of
  FeSe and NaFeAs
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Matthew Watson\nInstitute of Speaker: Diamond Ligh
 t Source\, United Kingdom\nTopics:\nMaterialien\, Physik\n Location:\n  Na
 me: IFW (D2E.27\, IFW Dresden)\n  Street: Helmholtzstraße 20\n  City: 010
 69 Dresden\n  Phone: \n  Fax: \nDescription: Abstract  The appearance of h
 igh-temperature superconductivity in the Fe-based superconductors is likel
 y to be linked to the variety of other ordered states found in their phase
  diagrams. Certain systems\, including FeSe\, exhibit an unusual `nematic'
  phase where fourfold symmetry of the lattice is spontaneously broken with
 out magnetic order. Angle-resolved photoemission spectroscopy (ARPES) meas
 urements of FeSe are able to give a unique insight into the evolution of t
 he electronic structure in the nematic phase. Previous ARPES measurements 
 have revealed substantial shifts of both the electron and hole bands assoc
 iated with the onset of the nematic order parameter\, however the interpre
 tation of these data has caused some controversy. One particularly importa
 nt issue has been the role played by the formation of twin orthorhombic do
 mains in samples.  Here I will argue that our high-resolution ARPES result
 s obtained on twinned samples [1\,2] point uniquely towards a “unidirect
 ional nematic bond ordering”. I will additionally present ARPES results 
 on ``detwinned” FeSe crystals [3]\, revealing remarkable anisotropies wh
 ich are hidden in measurements of twinned samples. Finally I will show new
  ARPES results on detwinned NaFeAs samples\, and discuss what aspects of t
 he electronic structure may be characteristic of nematic order.  [1] “Ev
 idence for unidirectional nematic bond ordering in FeSe”  M. D. Watson e
 t. al.\, Phys. Rev. B 94\, 201107(R) (2016)  [2] “Shifts and Splittings 
 of the Hole Bands in the Nematic Phase of FeSe” M. D. Watson et. al.\, J
 . Phys. Soc. Jpn. 86\, 053703 (2017)  [3] M. D. Watson et. al.\, arXiv:170
 5.02286 (2017)
DTSTAMP:20260921T060956Z
CREATED:20170824T080155Z
LAST-MODIFIED:20170925T080059Z
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