期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.206410
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资金
- Welch Foundation
- NRI SWAN Center
- National Science Foundation [DMR-0606489]
Energy transfer to acoustic phonons is the dominant low-temperature cooling channel of electrons in a crystal. For cold neutral graphene we find that the weak cooling power of its acoustic modes relative to their heat capacity leads to a power-law decay of the electronic temperature when far from equilibrium. For heavily doped graphene a high electronic temperature is shown to initially decrease linearly with time at a rate proportional to n(3/2) with n being the electronic density. The temperature at which cooling via optical phonon emission begins to dominate depends on graphene carrier density.
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