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Femtosecond control of phonon dynamics near a magnetic order critical point

Journal Article · · Nature Communications
 [1];  [2];  [3];  [3];  [4];  [4];  [4];  [4];  [5];  [5];  [6];  [5];  [7];  [8];  [3];  [1]
  1. Cornell Univ., Ithaca, NY (United States). Materials Science and Engineering Dept.
  2. Italian Inst. of Technology (IIT), Genova (Italy). Central Research Labs.; Scuola Normale Superiore, Pisa (Italy)
  3. Univ. of California, San Diego, CA (United States). Dept. of Physics; Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research
  4. Univ. of California, San Diego, CA (United States). Dept. of Physics
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  6. Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research; National Institute of Technology, Tadepalligudem, Andhra Pradesh, (India). Dept. of Physics
  7. Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research
  8. Italian Inst. of Technology (IIT), Genova (Italy). Central Research Labs.
The spin-phonon interaction in spin density wave (SDW) systems often determines the free energy landscape that drives the evolution of the system. When a passing energy flux, such as photoexcitation, drives a crystalline system far from equilibrium, the resulting lattice displacement generates transient vibrational states. Manipulating intermediate vibrational states in the vicinity of the critical point, where the SDW order parameter changes dramatically, would then allow dynamical control over functional properties. Here we combine double photoexcitation with an X-ray free-electron laser (XFEL) probe to control and detect the lifetime and magnitude of the intermediate vibrational state near the critical point of the SDW in chromium. We apply Landau theory to identify the mechanism of control as a repeated partial quench and sub picosecond recovery of the SDW. Our results showcase the capabilities to influence and monitor quantum states by combining multiple optical photoexcitations with an XFEL probe. They open new avenues for manipulating and researching the behaviour of photoexcited states in charge and spin order systems near the critical point.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; SC0001805; SC0018237; SC0019414
OSTI ID:
1812544
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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