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Title: Nonlinear delayed symmetry breaking in a solid excited by hard x-ray free electron laser pulses

We have studied the ultrafast changes of electronic states in bulk ZnO upon intense hard x-ray excitation from a free electron laser. By monitoring the transient anisotropy induced in an optical probe beam, we observe a delayed breaking of the initial c-plane symmetry of the crystal that lasts for several picoseconds. Interaction with the intense x-ray pulses modifies the electronic state filling in a manner inconsistent with a simple increase in electronic temperature. These results may indicate a way to use intense ultrashort x-ray pulses to investigate high-energy carrier dynamics and to control certain properties of solid-state materials.
Authors:
 [1] ;  [2] ; ; ; ;  [3] ; ; ;  [1] ; ; ; ;  [4] ; ;  [3] ;  [2] ;  [5]
  1. Institute for Quantum Electronics, ETH Zurich, CH-8093 Zurich (Switzerland)
  2. (Switzerland)
  3. Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
  4. LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
  5. SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)
Publication Date:
OSTI Identifier:
22398913
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; CHARGE CARRIERS; CRYSTALS; ELECTRONIC STRUCTURE; EXCITATION; FREE ELECTRON LASERS; HARD X RADIATION; MONITORING; NONLINEAR PROBLEMS; PHYSICAL RADIATION EFFECTS; PROBES; SOLIDS; SYMMETRY BREAKING; TRANSIENTS; ZINC OXIDES