7 papers
Bose-Einstein condensation and superfluidity on a fuzzy sphere
Vira Shyta, Flavio S. Nogueira, Ashley M. Cook
According to Hohenberg's theorem, Bose-Einstein condensation (BEC) in two dimensions is impossible for any temperature . By contrast, superfluidity does occur in two dimension…
Feynman paradox in a spherical axion insulator
Anastasiia Chyzhykova, Jeroen van den Brink, Flavio S. Nogueira
We show that a small charged probe near a spherical topological insulator causes the latter to rotate around a symmetry axis defined by the center of the sphere and the position of…
Real critical exponents from the -expansion in an interacting model with non-Hermitian anisotropy
Eduard Naichuk, Jeroen van den Brink, Flavio S. Nogueira
In quantum optics and condensed matter physics non-Hermitian phenomena are often studied under the assumption of an open physical system. However, there are examples of intrinsical…
Axion electrodynamics of Weyl superconductors with broken time-reversal symmetry
Vira Shyta, Jeroen van den Brink, Flavio S. Nogueira
The low-energy effective description of Weyl semimetals is defined by the axion electrodynamics, which captures the effects arising due to the presence of nodes of opposite chirali…
Hyperscaling of Fidelity and Operator Estimations in the Critical Manifold
Matheus H. Martins Costa, Flavio S. Nogueira, Jeroen van den Brink
By formulating the renormalization group as a quantum channel acting on density matrices in Quantum Field Theories (QFTs), we show that ground-state expectation values of observabl…
Antiferromagnetism and spin excitations in a two-dimensional non-Hermitian Hatano-Nelson flux model
Eduard Naichuk, Ilya M. Eremin, Jeroen van den Brink +1
The one-dimensional Hatano-Nelson model with non-reciprocal hoppings is a prominent example of a relatively simple non-Hermitian quantum-mechanical system, which allows to study va…