期刊
PHYSICAL REVIEW B
卷 103, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.L180101
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, through the Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC-0008574]
- Science Foundation Ireland [12/IA/1601]
- Irish Research Council [GOIPG/2015/2784]
- Science Foundation Ireland (SFI) [12/IA/1601] Funding Source: Science Foundation Ireland (SFI)
- Irish Research Council (IRC) [GOIPG/2015/2784] Funding Source: Irish Research Council (IRC)
In this study, an experimental approach was used to determine the excited-state interatomic forces in bismuth using femtosecond x-ray pulses. It was found that photoexcited carriers weaken nearest-neighbor forces, leading to a softening of transverse acoustic modes throughout the Brillouin zone. This demonstrates a bond-selective method for measuring electron-phonon coupling in a broad range of quantum materials undergoing photoinduced phase transitions and transient light-driven states.
We demonstrate an experimental approach to determining the excited-state interatomic forces using femtosecond x-ray pulses from an x-ray free-electron laser. We determine experimentally the excited-state interatomic forces that connect photoexcited carriers to the nonequilibrium lattice dynamics in the prototypical Peierls-distorted material, bismuth. The forces are obtained by a constrained least-squares fit of a pairwise interatomic force model to the excited-state phonon dispersion relation as measured by the time- and momentum-resolved x-ray diffuse scattering. We find that photoexcited carriers weaken predominantly the nearest-neighbor forces, which drives the measured softening of the transverse acoustic modes throughout the Brillouin zone as well as the zone-center A(1g) optical mode. This demonstrates a bond-selective approach to measuring electron-phonon coupling relevant to a broad range of photoinduced phase transitions and transient light-driven states in quantum materials.
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