Coherent/incoherent metal transition in a holographic model

Title
Coherent/incoherent metal transition in a holographic model
Other Titles
incoherent metal transition in a holographic model
Author
서윤석
Keywords
Gauge-gravity correspondence; Holography and condensed matter physics (AdS/CMT)
Issue Date
2014-12
Publisher
Springer
Citation
Journal of High Energy Physics, 2014, P.1-27
Abstract
We study AC electric (sigma), thermoelectric (alpha), and thermal ((kappa) over bar) conductivities in a holographic model, which is based on 3+1 dimensional Einstein-Maxwell-scalar action. There is momentum relaxation due to massless scalar fields linear to spatial coordinate. The model has three field theory parameters: temperature (T), chemical potential (mu), and effective impurity (beta). At low frequencies, if beta < mu, all three AC conductivities (sigma, alpha, <(kappa)over bar>) exhibit a Drude peak modified by pair creation contribution (coherent metal). The parameters of this modified Drude peak are obtained analytically. In particular, if beta << mu the relaxation time of electric conductivity approaches to 2 root 3 mu/beta(2) and the modified Drude peak becomes a standard Drude peak. If beta > mu the shape of peak deviates from the Drude form (incoherent metal). At intermediate frequencies (T < omega < mu), we have analysed numerical data of three conductivities (sigma, alpha, (kappa) over bar) for a wide variety of parameters, searching for scaling laws, which are expected from either experimental results on cuprates superconductors or some holographic models. In the model we study, we find no clear signs of scaling behaviour.
URI
https://link.springer.com/article/10.1007/JHEP12(2014)170http://hdl.handle.net/20.500.11754/49248
ISSN
1029-8479
DOI
10.1007/JHEP12
Appears in Collections:
RESEARCH INSTITUTE[S](부설연구소) > THE RESEARCH INSTITUTE FOR NATURAL SCIENCES(자연과학연구소) > Articles
Files in This Item:
Parmesan_Yohe_2003.pdfDownload
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE