Please use this identifier to cite or link to this item:
|Title:||Optical conductivity study of screening of many-body effects in graphene interfaces||Authors:||Gogoi, P.K.
Castro Neto, A.H.
|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|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jan 30, 2023
WEB OF SCIENCETM
checked on Jan 23, 2023
checked on Jan 26, 2023
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.