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Title: Ultrafast non-radiative dynamics of atomically thin MoSe2

Journal Article · · Nature Communications
 [1];  [2];  [3];  [3];  [1];  [4];  [2];  [2];  [2];  [4];  [4];  [3];  [2];  [3];  [3];  [5];  [4];  [6];  [7]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS), Stanford PULSE Inst.
  2. Rice Univ., Houston, TX (United States). Dept. of Materials Science and NanoEngineering
  3. Univ. of Southern California, Los Angeles, CA (United States). Collaboratory for Advanced Computing and Simulations
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Kumamoto Univ. (Japan). Dept. of Physics
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.

Non-radiative energy dissipation in photoexcited materials and resulting atomic dynamics provide a promising pathway to induce structural phase transitions in two-dimensional materials. However, these dynamics have not been explored in detail thus far because of incomplete understanding of interaction between the electronic and atomic degrees of freedom, and a lack of direct experimental methods to quantify real-time atomic motion and lattice temperature. Here, we explore the ultrafast conversion of photoenergy to lattice vibrations in a model bi-layered semiconductor, molybdenum diselenide, MoSe2. Specifically, we characterize sub-picosecond lattice dynamics initiated by the optical excitation of electronic charge carriers in the high electron-hole plasma density regime. Our results focuses on the first ten picosecond dynamics subsequent to photoexcitation before the onset of heat transfer to the substrate, which occurs on a ~100 picosecond time scale. Photoinduced atomic motion is probed by measuring the time dependent Bragg diffraction of a delayed mega-electronvolt femtosecond electron beam. Transient lattice temperatures are characterized through measurement of Bragg peak intensities and calculation of the Debye-Waller factor (DWF). These measurements show a sub-picosecond decay of Bragg diffraction and a correspondingly rapid rise in lattice temperatures. We estimate a high quantum yield for the conversion of excited charge carrier energy to lattice motion under our experimental conditions, indicative of a strong electron-phonon interaction. First principles nonadiabatic quantum molecular dynamics simulations (NAQMD) on electronically excited MoSe2 bilayers reproduce the observed picosecond-scale increase in lattice temperature and ultrafast conversion of photoenergy to lattice vibrations. Calculation of excited-state phonon dispersion curves suggests that softened vibrational modes in the excited state are involved in efficient and rapid energy transfer between the electronic system and the lattice.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515; SC00014607; AC02-05CH11231; ACI-1548562
OSTI ID:
1399583
Journal Information:
Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (6)

Ultrafast carrier and phonon dynamics in few-layer 2H–MoTe 2 journal September 2019
Quantum Dynamics at Scale: Ultrafast Control of Emergent Functional Materials
  • Tiwari, Subodh C.; Krishnamoorthy, Aravind; Rajak, Pankaj
  • HPCAsia2020: International Conference on High Performance Computing in Asia-Pacific Region, Proceedings of the International Conference on High Performance Computing in Asia-Pacific Region https://doi.org/10.1145/3368474.3368489
conference January 2020
Recent Advances in Ultrafast Structural Techniques journal April 2019
The lifetime of interlayer breathing modes of few-layer 2H-MoSe 2 membranes journal January 2019
Anisotropic structural dynamics of monolayer crystals revealed by femtosecond surface X-ray scattering journal March 2019
A THz driven split-ring resonator based ultrafast relativistic electron streak camera journal August 2019

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