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나노 구조 물리 연구단
나노구조물리 연구단
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Ultrafast zero balance of the oscillator-strength sum rule in graphene

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Title
Ultrafast zero balance of the oscillator-strength sum rule in graphene
Author(s)
Jaeseok Kim; Seong Chu Lim; Seung Jin Chae; Inhee Maeng; Younghwan Choi; Soonyoung Cha; Lee, Young Hee; Hyunyong Choi
Publication Date
2013-09
Journal
SCIENTIFIC REPORTS, v.3, no., pp.2663 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Oscillator-strength sum rule in light-induced transitions is one general form of quantum-mechanical identities. Although this sum rule is well established in equilibrium photo-physics, an experimental corroboration for the validation of the sum rule in a nonequilibrium regime has been a long-standing unexplored question. The simple band structure of graphene is an ideal system for investigating this question due to the linear Dirac-like energy dispersion. Here, we employed both ultrafast terahertz and optical spectroscopy to directly monitor the transient oscillator-strength balancing between quasi-free low-energy oscillators and high-energy Fermi-edge ones. Upon photo-excitation of hot Dirac fermions, we observed that the ultrafast depletion of high-energy oscillators precisely complements the increased terahertz absorption oscillators. Our results may provide an experimental priori to understand, for example, the intrinsic free-carrier dynamics to the high-energy photo-excitation, responsible for optoelectronic operation such as graphene-based phototransistor or solar-energy harvesting devices. © 2013 Macmillan Publishers Limited. All rights reserved.
URI
http://pr.ibs.re.kr/handle/8788114/1256
DOI
10.1038/srep02663
ISSN
2045-2322
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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