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Title: Nonthermal Bonding Origin of a Novel Photoexcited Lattice Instability in SnSe

Journal Article · · Physical Review Letters
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [5]; ORCiD logo [5];  [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [3];  [4]; ORCiD logo [1]
  1. University of Illinois at Urbana-Champaign, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford PULSE Institute
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford PULSE Institute; Arizona State University, Tempe, AZ (United States)
  3. Duke University, Durham, NC (United States)
  4. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford PULSE Institute
  5. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  6. Duke University, Durham, NC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  7. Duke University, Durham, NC (United States); Indian Institute of Technology Bombay, Mumbai (India)
  8. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  9. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford PULSE Institute; Stanford University, CA (United States)

Lattice dynamics measurements are often crucial tools for understanding how materials transform between different structures. Here, we report time-resolved x-ray scattering-based measurements of the nonequilibrium lattice dynamics in SnSe, a monochalcogenide reported to host a novel photoinduced lattice instability. By fitting interatomic force models to the fluence dependent excited-state dispersion, we determine the nonthermal origin of the lattice instability to be dominated by changes of interatomic interactions along a bilayer-connecting bond, rather than of an intralayer bonding network that is of primary importance to the lattice instability in thermal equilibrium.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Fitzpatrick Institute for Photonics
Grant/Contract Number:
AC02-76SF00515; SC0019978; AC05-00OR22725
OSTI ID:
2223107
Alternate ID(s):
OSTI ID: 2203803
Journal Information:
Physical Review Letters, Vol. 131, Issue 15; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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