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<i>R</i><sup>2</sup> corrections to asymptotically Lifshitz spacetimes
IOP Publishing Ltd 2009 Journal of high energy physics Vol.2009 No.10
We study <I>R</I><SUP>2</SUP> corrections to five-dimensional asymptotically Lifshitz spacetimes by adding Gauss-Bonnet terms in the effective action. For the zero-temperature backgrounds we obtain exact solutions in both pure Gauss-Bonnet gravity and Gauss-Bonnet gravity with non-trivial matter. The dynamical exponent undergoes finite renormalization in the latter case. For the finite-temperature backgrounds we obtain black brane solutions perturbatively and calculate the ratio of shear viscosity to entropy density η/<I>s</I>. The KSS bound is still violated but unlike the relativistic counterparts, the causality of the boundary field theory cannot be taken as a constraint.
A HOLOGRAPHIC MODEL OF STRANGE METALS
LEE, BUM-HOON,PANG, DA-WEI,PARK, CHANYONG World Scientific 2011 International Journal of Modern Physics A Vol.26 No.14
<P> We give a review on our recent work arXiv:1006.0779 [hep-th] and arXiv:1006.1719 [hep-th], in which properties of holographic strange metals were investigated. The background is chosen to be anisotropic scaling solution in Einstein-Maxwell-Dilaton theory with a Liouville potential. The effects of bulk Maxwell field, an extra U(1) gauge field and probe D-branes on the DC conductivity, the DC Hall conductivity and the AC conductivity are extensively analyzed. We classify behaviors of the conductivities according to the parameter ranges in the bulk theory and characterize conditions when the holographic results can reproduce experimental data. </P>
Chun, Sungwoo,Kim, Da Wan,Kim, Jiwon,Pang, Changhyun IOP 2019 Nanotechnology Vol.30 No.33
<P>Strong peeling resistance and water-drainable properties on rough and wet skin surfaces are highly desirable for realizing wearable and skin-attachable electronic sensors. Here, we propose a transparent, sensitive, glue-free pressure sensor for skin electronics. To achieve a thin, light-weight, transparent, and stretchable sensor patch, we laminated a single-layer graphene film as a sensing element on a thin polymeric supporter of polydimethylsiloxane. By assembling the graphene layer with densely populated micropillars, the pressure sensor achieved 10 times the sensitivity of a similar sensor without micropillars in the low-pressure range (<6 kPa). We then employed hexagonal patterns inspired by the toe pads of a tree frog, giving the assembled patch sensor with strong peeling resistance under both dry and wet conditions on surfaces such as silicon (15.5 J cm<SUP>−2</SUP> for dry and 11.6 J cm<SUP>−2</SUP> for wet conditions) and pig skin (2.0 J cm<SUP>−2</SUP> for dry and 1.4 J cm<SUP>−2</SUP> for wet conditions) without contamination after detachment. Our layered sensor patch also demonstrated successful measurement of water-dependent skin elasticity with transparent, conformal, and residual-free attachment, suggesting a variety of cosmetic and medical applications.</P>