Physics Letters B 758 (2016) 226–234
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Holographic conductivity for logarithmic charged dilaton-Lifshitz
solutions
A. Dehyadegari
a
, A. Sheykhi
a,b,∗
, M. Kord Zangeneh
a
a
Physics Department and Biruni Observatory, Shiraz University, Shiraz 71454, Iran
b
Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P.O. Box 55134-441, Maragha, Iran
a r t i c l e i n f o a b s t r a c t
Article history:
Received
18 April 2016
Received
in revised form 28 April 2016
Accepted
29 April 2016
Available
online 3 May 2016
Editor: N.
Lambert
We disclose the effects of the logarithmic nonlinear electrodynamics on the holographic conductivity
of Lifshitz dilaton black holes/branes. We analyze thermodynamics of these solutions as a necessary
requirement for applying gauge/gravity duality, by calculating conserved and thermodynamic quantities
such as the temperature, entropy, electric potential and mass of the black holes/branes. We calculate the
holographic conductivity for a (2 +1)-dimensional brane boundary and study its behavior in terms of the
frequency per temperature. Interestingly enough, we find out that, in contrast to the Lifshitz–Maxwell-
dilaton
black branes which have conductivity for all z, here in the presence of nonlinear gauge field, the
holographic conductivity does exist provided z ≤ 3and vanishes for z > 3. It is shown that independent of
the nonlinear parameter β, the real part of the conductivity is the same for a specific value of frequency
per temperature in both AdS and Lifshitz cases. Besides, the behavior of real part of conductivity for large
frequencies has a positive slope with respect to large frequencies for a system with Lifshitz symmetry
whereas it tends to a constant for a system with AdS symmetry. This behavior may be interpreted as
existence of an additional charge carrier rather than the AdS case, and is due to the presence of the
scalar dilaton field in model. Similar behavior for optical conductivity of single-layer graphene induced
by mild oxygen plasma exposure has been reported.
© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
The idea of correspondence between gravity in an anti-de Sit-
ter
(AdS) spaces and a conformal field theory (CFT) living on its
boundary (AdS/CFT) [1–3] has been successful in many theories
like superconductors, quark-gluon plasma and entanglement en-
tropy.
In recent years, the extension of AdS/CFT correspondence to
other gauge field theories and various spacetimes (gravity theories)
have got a lot of enthusiasm and usually is called gauge/grav-
ity
duality in the literatures. It has been well established that
the gauge/gravity duality provides powerful tools for exploring dy-
namics
of strongly coupled field theories and physics of our real
Universe. Recently, an interesting application of gauge/gravity du-
ality
in condensed matter physics was suggested by Hartnoll, et al.
[4,5] who
demonstrated that some properties of strongly coupled
superconductors have dual gravitational descriptions. Such strongly
*
Corresponding author.
E-mail
addresses: asheykhi@shirazu.ac.ir (A. Sheykhi), mkzangeneh@shirazu.ac.ir
(M. Kord Zangeneh).
coupled superconducting phases of the boundary field theory are
termed holographic superconductors in the literatures.
On
the other hand, the dynamics of many condensed matter
systems near the critical point can be described by a relativistic
CFT or a more subtle scaling theory respecting the Lifshitz sym-
metry
[6]
t →λ
z
t,
x →λ
x. (1)
The spacetime which supports the above symmetry on its r-infinity
boundary is known as Lifshitz spacetime and has the line element
[6]
ds
2
=−
r
2z
l
2z
dt
2
+
l
2
dr
2
r
2
+r
2
d
x
2
, (2)
where z is dynamical critical exponent. Black hole spacetime
with asymptotic Lifshitz symmetry has been widely investigated
in the literature. For example, thermodynamics of asymptotic Lif-
shitz
black solutions in the presence of massive gauge fields have
been
studied in [7]. The generalization to include the higher curva-
ture
corrections terms to Einstein gravity and thermodynamics of
http://dx.doi.org/10.1016/j.physletb.2016.04.062
0370-2693/
© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.