Universal spin Hall conductance fluctuations in chaotic Dirac quantum dots

TC Vasconcelos, J Ramos, ALR Barbosa - Physical Review B, 2016 - APS
We present complete analytical and numerical results that demonstrate the anomalous
universal fluctuations of the spin Hall conductance in chiral materials such as graphene and …

Universal Braess paradox in open quantum dots

ALR Barbosa, D Bazeia, J Ramos - Physical Review E, 2014 - APS
We present analytical and numerical results that demonstrate the presence of the Braess
paradox in chaotic quantum dots. The paradox that we identify, originally perceived in …

Conductance peak density in nanowires

T Verçosa, YJ Doh, J Ramos, ALR Barbosa - Physical Review B, 2018 - APS
We present a complete numerical calculation and an experimental data analysis of the
universal conductance fluctuations in quasi-one-dimensional nanowires. The conductance …

Cross-section fluctuations in open microwave billiards and quantum graphs: The counting-of-maxima method revisited

B Dietz, A Richter, R Samajdar - Physical Review E, 2015 - APS
The fluctuations exhibited by the cross sections generated in a compound-nucleus reaction
or, more generally, in a quantum-chaotic scattering process, when varying the excitation …

Conductance peak density in disordered graphene topological insulators

LGCS Sá, ALR Barbosa, J Ramos - Physical Review B, 2020 - APS
We investigate the universal properties of quantum transport in graphene nanowires that
engender subtle universal conductance fluctuations. We present results for three of the main …

Correlation functions and correlation widths in quantum-chaotic scattering for mesoscopic systems and nuclei

J Ramos, ALR Barbosa, BV Carlson, T Frederico… - Physical Review E, 2016 - APS
We derive analytical expressions for the correlation functions of the electronic conductance
fluctuations of an open quantum dot under several conditions. Both the variation of energy …

Mechanism of universal conductance fluctuations

VV Brazhkin, IM Suslov - Journal of Physics: Condensed Matter, 2020 - iopscience.iop.org
Universal conductance fluctuations are usually observed in the form of aperiodic oscillations
in the magnetoresistance of thin wires as a function of the magnetic field B. If such …

Mesoscopic Fluctuations: Nuclei, Quantum Dots, and Beyond

J Ramos, ALR Barbosa, D Bazeia… - Brazilian Journal of …, 2021 - Springer
Mesoscopic Fluctuations: Nuclei, Quantum Dots, and Beyond | Brazilian Journal of Physics
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Entanglement distribution statistic in Andreev billiards

J Ramos, AF Macedo-Junior, ALR Barbosa - The European Physical …, 2017 - Springer
We investigate statistical aspects of the entanglement production for open chaotic
mesoscopic billiards in contact with superconducting parts, known as Andreev billiards. The …

Statistical features of the thermal neutron capture cross sections

MS Hussein, BV Carlson, AK Kerman - arXiv preprint arXiv:1506.03246, 2015 - arxiv.org
We discuss the existence of huge thermal neutron capture cross sections in several nuclei.
The values of the cross sections are several orders of magnitude bigger than expected at …