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12 papers · 1 filter
A first encounter with exceptional points in a quantum model
C. A. Downing, V. A. Saroka
An exceptional point is a special point in parameter space at which two (or more) eigenvalues and eigenvectors coincide. The discovery of exceptional points within mechanical and o…
Propulsion force and heat transfer for nonreciprocal nanoparticles
Laila Henkes, Kiryl Asheichyk, Matthias Krüger
We analyze heat transfer and Casimir forces involving a nonreciprocal nanoparticle. By dissecting the resulting expressions into reciprocal and nonreciprocal contributions, we find…
Time-dependent radiative heat flux after the beginning of thermal radiation
Kiryl Asheichyk
We develop a theoretical formalism for time-dependent radiative heat flux from one object to another in the case where the former starts radiating at a certain time. The time depen…
Exact quantum-mechanical equations for particle beams
Alexander J. Silenko
The exact quantum-mechanical equations for beams of free particles including photons and for beams of Dirac and spin-1 particles in a uniform magnetic field have been derived. Thes…
Position and spin in relativistic quantum mechanics
Liping Zou, Pengming Zhang, Alexander J. Silenko
The problem of the position and spin in relativistic quantum mechanics is analyzed in detail. It is definitively shown that the position and spin operators in the Foldy-Wouthuysen…
Electric quadrupole moment and the tensor magnetic polarizability of twisted electrons and a potential for their measurements
Alexander J. Silenko, Pengming Zhang, Liping Zou
For a twisted (vortex) Dirac particle in nonuniform electric and magnetic fields, the relativistic Foldy-Wouthuysen Hamiltonian is derived including high order terms describing new…