Journal
PHYSICAL REVIEW B
Volume 81, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.165405
Keywords
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Funding
- U.S. Department of Energy, Division of Materials Sciences through the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana-Champaign [DE-FG02-07ER46459]
- U.S. Department of Energy [DE-FG02-07ER46453, DE-FG02-07ER46471]
- National Science Foundation [DMR-0905175]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0905175] Funding Source: National Science Foundation
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We report lifetimes of optical phonons (OPs) in graphene and graphite measured by time-resolved anti-Stokes Raman scattering. Lifetimes in graphite and monolayer graphene are 2.4 and 1.2 ps, respectively. For graphite and graphene with more than five layers, the lifetimes decrease with increasing temperature as similar to 1/T, indicating the dominance of anharmonic processes in the decay of the OP population. The decrease in lifetime with decreasing number of layers suggests an additional decay channel through which excitations in graphene interact directly with lattice vibrations of the a-SiO2 substrate.
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