Dirac oscillator in a spinning cosmic string spacetime in external magnetic fields: Investigation of the energy spectrum and the connection with condensed matter physics

Márcio M. Cunha; Henrique S. Dias; Edilberto O. Silva

doi:10.1103/physrevd.102.105020

Dirac oscillator in a spinning cosmic string spacetime in external magnetic fields: Investigation of the energy spectrum and the connection with condensed matter physics

Physical Review D ◽

10.1103/physrevd.102.105020 ◽

2020 ◽

Vol 102 (10) ◽

Author(s):

Márcio M. Cunha ◽

Henrique S. Dias ◽

Edilberto O. Silva

Keyword(s):

Energy Spectrum ◽

Magnetic Fields ◽

Cosmic String ◽

Condensed Matter ◽

Condensed Matter Physics ◽

Dirac Oscillator

Download Full-text

Self-Adjoint Extension Approach to Motion of Spin-1/2 Particle in the Presence of External Magnetic Fields in the Spinning Cosmic String Spacetime

Universe ◽

10.3390/universe6110203 ◽

2020 ◽

Vol 6 (11) ◽

pp. 203

Author(s):

Márcio M. Cunha ◽

Edilberto O. Silva

Keyword(s):

Energy Spectrum ◽

Dirac Equation ◽

Magnetic Fields ◽

Cosmic String ◽

Relativistic Quantum ◽

Wave Functions ◽

The Self ◽

Extension Method ◽

Adjoint Extension ◽

Quantum Motion

In this work, we study the relativistic quantum motion of an electron in the presence of external magnetic fields in the spinning cosmic string spacetime. The approach takes into account the terms that explicitly depend on the particle spin in the Dirac equation. The inclusion of the spin element in the solution of the problem reveals that the energy spectrum is modified. We determine the energies and wave functions using the self-adjoint extension method. The technique used is based on boundary conditions allowed by the system. We investigate the profiles of the energies found. We also investigate some particular cases for the energies and compare them with the results in the literature.

Download Full-text

Ideal diamagnetic response at room temperature by graphene-n-heptane-permalloy system

Modern Physics Letters B ◽

10.1142/s0217984920504151 ◽

2020 ◽

Vol 34 (36) ◽

pp. 2050415

Author(s):

Yasushi Kawashima ◽

Rajendra Dulal ◽

Serafim Teknowijoyo ◽

Sara Chahid ◽

Armen Gulian

Keyword(s):

Magnetic Fields ◽

Graphene Layer ◽

Room Temperature ◽

Condensed Matter ◽

Condensed Matter Physics ◽

Diamagnetic Response ◽

Quantum Phenomenon ◽

The Moment ◽

Three Components

Perfect screening of sub-milligauss magnetic fields (ideal diamagnetism) by a system comprised of a graphene and thin permalloy foil parallel to the graphene layer immersed in [Formula: see text]-heptane is observed at room temperature. The presence of all three components is necessary for the effect to occur. Ideal diamagnetic response appears at the moment of [Formula: see text]-heptane injection and disappears when the liquid evaporates. Until then, no change of diamagnetic moment occurs at further variation of the field. The observed ideal diamagnetic feature is either a footprint of a novel type of superconductivity at room temperature or a yet unknown quantum phenomenon in condensed matter physics.

Download Full-text

The chiral anomaly, Dirac and Weyl semimetals, and force-free magnetic fields

Canadian Journal of Physics ◽

10.1139/cjp-2016-0522 ◽

2017 ◽

Vol 95 (8) ◽

pp. 711-714

Author(s):

Gerald E. Marsh

Keyword(s):

Magnetic Fields ◽

Condensed Matter ◽

Relaxation Times ◽

Chiral Anomaly ◽

Quantum Mechanical ◽

Condensed Matter Physics ◽

Macroscopic Appearance ◽

Weyl Semimetals ◽

Current Relaxation

The chiral anomaly is a purely quantum mechanical phenomenon that has a long history dating back to the late 1960s. Surprisingly, it has recently made a macroscopic appearance in condensed matter physics. A brief introduction to the relevant features of this anomaly is given and it is shown that its appearance in condensed matter systems must involve force-free magnetic fields, which may help explain the long current relaxation times in Dirac and Weyl semimetals.

Download Full-text

Inelastic scattering at surfaces and interfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100143560 ◽

1986 ◽

Vol 44 ◽

pp. 392-393

Author(s):

R. H. Ritchie ◽

A. Howie

Keyword(s):

Inelastic Scattering ◽

Surface Properties ◽

Correlation Energy ◽

Condensed Matter ◽

Charged Particles ◽

Condensed Matter Physics ◽

Optical Phonons ◽

Exchange Correlation ◽

Surfaces And Interfaces ◽

Inelastic Interactions

An important part of condensed matter physics in recent years has involved detailed study of inelastic interactions between swift electrons and condensed matter surfaces. Here we will review some aspects of such interactions.Surface excitations have long been recognized as dominant in determining the exchange-correlation energy of charged particles outside the surface. Properties of surface and bulk polaritons, plasmons and optical phonons in plane-bounded and spherical systems will be discussed from the viewpoint of semiclassical and quantal dielectric theory. Plasmons at interfaces between dissimilar dielectrics and in superlattice configurations will also be considered.

Download Full-text