Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Holger Cartarius"'
Publikováno v:
Physics, Vol 4, Iss 4, Pp 1241-1252 (2022)
With quantum physics being a particularly difficult subject to teach because of its contextual distance from everyday life, the need for multiperspective teaching material arises. Quantum physics education aims at exploring these methods but often la
Externí odkaz:
https://doaj.org/article/d615aa2f7ed24661a3fd4349cdb29a8a
SIMPLE MODELS OF THREE COUPLED PT -SYMMETRIC WAVE GUIDES ALLOWING FOR THIRD-ORDER EXCEPTIONAL POINTS
Publikováno v:
Acta Polytechnica, Vol 57, Iss 6, Pp 454-461 (2017)
We study theoretical models of three coupled wave guides with a PT-symmetric distribution of gain and loss. A realistic matrix model is developed in terms of a three-mode expansion. By comparing with a previously postulated matrix model it is shown h
Externí odkaz:
https://doaj.org/article/4ce4fa4b105645348d44c7e94ee9503d
Publikováno v:
Acta Polytechnica, Vol 57, Iss 6, Pp 470-476 (2017)
We numerically investigate topological phases of periodic lattice systems in tight-binding description under the influence of dissipation. The effects of dissipation are effectively described by PT-symmetric potentials. In this framework we develop a
Externí odkaz:
https://doaj.org/article/48d2fb62b968417d860fbf1560314b25
Publikováno v:
Acta Polytechnica, Vol 54, Iss 2 (2014)
A Bose-Einstein condensate trapped in a double-well potential, where atoms are incoupled to one side and extracted from the other, can in the mean-field limit be described by the nonlinear Gross-Pitaevskii equation (GPE) with a PT symmetric external
Externí odkaz:
https://doaj.org/article/5e9d3655cb1a480e906e185229dbb32c
Publikováno v:
Acta Polytechnica, Vol 54, Iss 2 (2014)
We consider the linear and nonlinear Schrödinger equation for a Bose-Einstein condensate in a harmonic trap with PT-symmetric double-delta function loss and gain terms. We verify that the conditions for the applicability of a recent proposition by M
Externí odkaz:
https://doaj.org/article/f9af08176a324833b5dcdab6f71af981
Publikováno v:
Acta Polytechnica, Vol 53, Iss 3 (2013)
We investigate the Gross-Pitaevskii equation for a Bose-Einstein condensate in a PT symmetric double-well potential by means of the time-dependent variational principle and numerically exact solutions. A one-dimensional and a fully three-dimensional
Externí odkaz:
https://doaj.org/article/b337e4f7f7dd435b93e02538ee02a6e1
Publikováno v:
Physical Review A. 100
On a two-dimensional planar parity-time-($\mathcal{PT}$-)symmetric nonlinear magnetic metamaterial, consisting of split-ring dimers with balanced gain and loss, discrete breather solutions can be found. We extend these studies and by numerical calcul
Publikováno v:
Physical Review A. 100
It is shown that the distinct oscillations of the purity of the single-particle density matrix for many-body open quantum systems with balanced gain and loss reported by Dast et al. [Phys. Rev. A 93, 033617 (2016)] can also be found in closed quantum
Balanced gain and loss leads to stationary dynamics in open systems. This occurs naturally in PT-symmetric systems, where the imaginary part of the potential describing gain and loss is perfectly antisymmetric. While this case seems intuitive, statio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce5bea2167ee8ae0cb54a15bef1abe28
Topological edge states in the Su-Schrieffer-Heeger model subject to balanced particle gain and loss
Publikováno v:
The European Physical Journal D. 72
We investigate the Su-Schrieffer-Heeger model in presence of an injection and removal of particles, introduced via a master equation in Lindblad form. It is shown that the dynamics of the density matrix follows the predictions of calculations in whic