Journal
NATIONAL SCIENCE REVIEW
Volume 8, Issue 4, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa242
Keywords
quantum relaxation time; plasma resonance; dielectric loss function
Categories
Funding
- National Key Project of Research and Development Plan [2018YFB0703600]
- High-level Special Funds [G02256301, G02256401]
- Guangdong Provincial Key Laboratory of Computational Science and Material Design [2019B030301001]
- Introduced Innovative R&D Team of Guangdong [2017ZT07C062]
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Through optical measurement, the quantum relaxation time of electrons in condensed matters can be directly determined, revealing the characteristics of quantum relaxation time at zero and non-zero frequencies, and the dominant contribution of bound electrons to the quantum relaxation time of conduction electrons at optical frequencies.
The quantum relaxation time of electrons in condensed matters is an important physical property, but its direct measurement has been elusive for a century. Here, we report a breakthrough that allows direct determination of quantum relaxation time at zero and non-zero frequencies using optical measurement. Through dielectric loss function, we connect bound electron effects to the physical parameters of plasma resonance and find an extra term of quantum relaxation time from inelastic scattering between bound electrons and conduction electrons at non-zero frequencies. We demonstrate here that the frequency-dependent inelastic polarization effect of bound electrons is the dominant contribution to quantum relaxation time of conduction electrons at optical frequencies, and the elastic polarization effect of bound electrons also dramatically changes the plasma resonance frequency through effective screening to charge carriers.
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