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Strongly Coupled 饾挮饾挴-Symmetric Models in Holography.
Entropy (Basel)
December 2024
Instituto de F铆sica Te贸rica UAM/CSIC, Campus de Cantoblanco, c/Nicol谩s Cabrera 13-15, 28049 Madrid, Spain.
Non-Hermitian quantum field theories are a promising tool to study open quantum systems. These theories preserve unitarity if PT symmetry is respected, and in that case, an equivalent Hermitian description exists via the so-called Dyson map. Generically, PT-symmetric non-Hermitian theories can also feature phases where PT symmetry is broken and unitarity is lost.
View Article and Find Full Text PDFQuenching the Chiral Magnetic Effect via the Gravitational Anomaly and Holography.
Phys Rev Lett
February 2018
Instituto de F铆sica Te贸rica UAM/CSIC, C/ Nicol谩s Cabrera 13-15, Cantoblanco, 28049 Madrid, Spain.
In the presence of a gravitational contribution to the chiral anomaly, the chiral magnetic effect induces an energy current proportional to the square of the temperature in equilibrium. In holography the thermal state corresponds to a black hole. We numerically study holographic quenches in which a planar shell of scalar matter falls into a black hole and raises its temperature.
View Article and Find Full Text PDFExperimental signatures of the mixed axial-gravitational anomaly in the Weyl semimetal NbP.
Nature
July 2017
Institute of Nanostructure and Solid State Physics, Universit盲t Hamburg, Jungiusstra脽e 11, 20355 Hamburg, Germany.
The conservation laws, such as those of charge, energy and momentum, have a central role in physics. In some special cases, classical conservation laws are broken at the quantum level by quantum fluctuations, in which case the theory is said to have quantum anomalies. One of the most prominent examples is the chiral anomaly, which involves massless chiral fermions.
View Article and Find Full Text PDFOdd Viscosity in the Quantum Critical Region of a Holographic Weyl Semimetal.
Phys Rev Lett
August 2016
Instituto de F铆sica Te贸rica UAM/CSIC, C/Nicol谩s Cabrera 13-15, Universidad Aut贸noma de Madrid, Cantoblanco, 28049 Madrid, Spain.
We study odd viscosity in a holographic model of a Weyl semimetal. The model is characterized by a quantum phase transition from a topological semimetal to a trivial semimetal state. Since the model is axisymmetric in three spatial dimensions there are two independent odd viscosities.
View Article and Find Full Text PDFQuantum Phase Transition between a Topological and a Trivial Semimetal from Holography.
Phys Rev Lett
February 2016
Instituto de F铆sica Te贸rica UAM/CSIC, C/Nicol谩s Cabrera 13-15, Universidad Aut贸noma de Madrid, Cantoblanco, 28049 Madrid, Spain.
We present a holographic model of a topological Weyl semimetal. A key ingredient is a time-reversal breaking parameter and a mass deformation. Upon varying the ratio of mass to time-reversal breaking parameter the model undergoes a quantum phase transition from a topologically nontrivial semimetal to a trivial one.
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