Please use this identifier to cite or link to this item: https://doi.org/10.1209/0295-5075/99/67009
Title: Optical conductivity study of screening of many-body effects in graphene interfaces
Authors: Gogoi, P.K.
Santoso, I. 
Saha, S.
Wang, S.
Castro Neto, A.H. 
Loh, K.P. 
Venkatesan, T. 
Rusydi, A. 
Issue Date: Sep-2012
Citation: Gogoi, P.K., Santoso, I., Saha, S., Wang, S., Castro Neto, A.H., Loh, K.P., Venkatesan, T., Rusydi, A. (2012-09). Optical conductivity study of screening of many-body effects in graphene interfaces. EPL 99 (6) : -. ScholarBank@NUS Repository. https://doi.org/10.1209/0295-5075/99/67009
Abstract: Theoretical studies have shown that electron-electron (e-e) and electron-hole (e-h) interactions play important roles in many observed quantum properties of graphene making this an ideal system to study many-body effects. In this report we show that spectroscopic ellipsometry can enable us to measure this interactions quantitatively. We present spectroscopic data in two extreme systems of graphene on quartz (GOQ), an insulator, and graphene on copper (GOC), a metal which show that for GOQ, both e-e and e-h interactions dominate while for GOC e-h interactions are screened. The data further enables the estimation of the strength of the many-body interaction through the effective fine-structure constant, α* g. The α* g for GOQ indicates a strong correlation with an almost energy-independent value of about 1.37. In contrast, the α* g value of GOC is photon energy dependent and is almost two orders of magnitude lower at low energies indicating very weak correlation. © 2012 Copyright EPLA.
Source Title: EPL
URI: http://scholarbank.nus.edu.sg/handle/10635/82829
ISSN: 02955075
DOI: 10.1209/0295-5075/99/67009
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