Prohlížení Acta Polytechnica. 2022, vol. 62, no.1 dle autora "Contreras-Astorga, Alonso"
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Linearised coherent states for non-rational SUSY extensions of the harmonic oscillator
Autor: Contreras-Astorga, Alonso; Fernández C., David J.; Muro-Cabral, César
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this work, we derive two equivalent non-rational extensions of the quantum harmonic oscillator using two different supersymmetric transformations. For these extensions, we built ladder operators as the product of the ... -
Photonic graphene under strain with position-dependent gain and loss
Autor: Castillo-Celeita, Miguel; Contreras-Astorga, Alonso; Fernández C., David J.
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)We work with photonic graphene lattices under strain with gain and loss, modeled by the Dirac equation with an imaginary mass term. To construct such Hamiltonians and their solutions, we use the free-particle Dirac equation ... -
Time-dependent step-like potential with a freezable bound state in the continuum
Autor: Gutiérrez Altamirano, Izamar; Contreras-Astorga, Alonso; Raya Montaño , Alfredo
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this work, we construct a time-dependent step-like potential supporting a normalizable state with energy embedded in the continuum. The potential is allowed to evolve until a stopping time ti, where it becomes static. ...