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Title: Ultrafast lattice dynamics in lead selenide quantum dot induced by laser excitation

We directly monitored the lattice dynamics in PbSe quantum dots induced by laser excitation using ultrafast electron di raction. The energy relaxation between the carriers and the lattice took place within 10 ps, showing no evidence of any signi cant phonon bottleneck e ect. Meanwhile, the lattice dilation exhibited some unusual features that could not be explained by the available mechanisms of photon- induced acoustic vibrations in semiconductors alone. The heat transport between the QDs and the substrate deviates signi cantly from Fourier's Law, which opens questions about the heat transfer under nonequilibrium conditions in nanoscale materials.
Authors:
 [1] ; ORCiD logo [2] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ; ORCiD logo [3] ;  [3] ;  [4] ;  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. Columbia Univ., New York, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-113634-2017-JA
Journal ID: ISSN 0003-6951; R&D Project: MA015MACA; KC0201010; TRN: US1701542
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 15; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; PbSe quantum dot; phonon bottleneck; ultrafast electron diffraction; lattice dynamics
OSTI Identifier:
1347299