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Title: Strong laser polarization control of coherent phonon excitation in van der Waals material Fe3GeTe2

Journal Article · · npj 2D Materials and Applications
ORCiD logo [1];  [2];  [3];  [4];  [5];  [3];  [3];  [3]; ORCiD logo [6];  [6];  [3]; ORCiD logo [5]
  1. College of Charleston, SC (United States); College of Charleston, Charleston, SC (United States)
  2. University of South Carolina, Columbia, SC (United States)
  3. College of Charleston, SC (United States)
  4. University of South Carolina, Columbia, SC (United States); Shenyang University of Technology, Shenyang (China)
  5. University of Maryland, College Park, MD (United States)
  6. Rutgers University, Piscataway, NJ (United States)

Optical manipulation of coherent phonon frequency in two-dimensional (2D) materials could advance the development of ultrafast phononics in atomic-thin platforms. However, conventional approaches for such control are limited to doping, strain, structural or thermal engineering. Here, we report the experimental observation of strong laser-polarization control of coherent phonon frequency through time-resolved pump-probe spectroscopic study of van der Waals (vdW) materials Fe3GeTe2. When the polarization of the pumping laser with tilted incidence is swept between in-plane and out-of-plane orientations, the frequencies of excited phonons can be monotonically tuned by as large as 3% (~100 GHz). Our first-principles calculations suggest the strong planar and vertical inter-atomic interaction asymmetry in layered materials accounts for the observed polarization-dependent phonon frequencies, as in-plane/out-of-plane polarization modifies the restoring force of the lattice vibration differently. Our work provides insightful understanding of the coherent phonon dynamics in layered vdW materials and opens up new avenues to optically manipulating coherent phonons.

Research Organization:
Rutgers University, Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); Northrop Grumman; Naval Air Warfare Center; US Army Research Laboratory (USARL)
Grant/Contract Number:
FG02-07ER46382
OSTI ID:
1978715
Journal Information:
npj 2D Materials and Applications, Journal Name: npj 2D Materials and Applications Journal Issue: 1 Vol. 6; ISSN 2397-7132
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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