Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Naether, Uta"'
Publikováno v:
Phys. Rev. A 97, 053846 (2018)
The Hermiticity axiom of quantum mechanics guarantees that the energy spectrum is real and the time evolution is unitary (probability-preserving). Nevertheless, non-Hermitian but $\mathcal{PT}$-symmetric Hamiltonians may also have real eigenvalues. S
Externí odkaz:
http://arxiv.org/abs/1801.06678
Publikováno v:
Phys. Rev. E 92, 032912 (2015)
We discuss the properties of nonlinear localized modes in sawtooth lattices, in the framework of a discrete nonlinear Schr\"odinger model with general on-site nonlinearity. Analytic conditions for existence of exact compact three-site solutions are o
Externí odkaz:
http://arxiv.org/abs/1507.03433
Publikováno v:
Phys. Rev. A 91, 033823 (2015)
We demonstrate that stationary localized solutions (discrete solitons) exist in a one dimensional Bose-Hubbard lattices with gain and loss in the semiclassical regime. Stationary solutions, by defi- nition, are robust and do not demand for state prep
Externí odkaz:
http://arxiv.org/abs/1411.6613
Publikováno v:
Phys. Lett. A 379, 988 (2015)
In this work, we study long-time wave transport in correlated and uncorrelated disordered 2D arrays. When a separation of dimensions is applied to the model, we find that the predicted 1D random dimer phenomenology also appears in so-called pseudo-2D
Externí odkaz:
http://arxiv.org/abs/1409.7592
Autor:
Rojas, Santiago Rojas, Morales-Inostroza, Luis, Naether, Uta, Xavier, Guilherme B., Nolte, Stefan, Szameit, Alexander, Vicencio, Rodrigo A., Lima, Gustavo, Delgado, Aldo
We study the polarization properties of elliptical femtosecond-laser-written waveguides arrays. A new analytical model is presented to explain the asymmetry of the spatial transverse profiles of linearly polarized modes in these waveguides. This asym
Externí odkaz:
http://arxiv.org/abs/1409.2239
Autor:
Jenkins, Mark David, Naether, Uta, Ciria, Miguel, Sesé, Javier, Atkinson, James, Sánchez-Azqueta, Carlos, del Barco, Enrique, Majer, Johannes, Zueco, David, Luis, Fernando
Publikováno v:
Appl. Phys. Lett. 105, 162601 (2014)
We report on the design, fabrication and characterization of superconducting coplanar waveguide resonators with nanoscopic constrictions. By reducing the size of the center line down to 50 nm, the radio frequency currents are concentrated and the mag
Externí odkaz:
http://arxiv.org/abs/1409.1040
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 48, 055302 (2015)
The stationary properties of the Bose-Hubbard model under squeezed dissipation are investigated. The dissipative model does not possess a $U(1)$ symmetry, but parity is conserved: $\langle a_j \rangle \to -\langle a_j \rangle$. We find that $\langle
Externí odkaz:
http://arxiv.org/abs/1409.0361
Publikováno v:
Phys.Rev. Lett. 112, 074101 (2014)
The classical and quantum dynamics of two ultra-strongly coupled and weakly nonlinear resonators cannot be explained using the Discrete Nonlinear Schr\"odinger Equation or the Bose-Hubbard model, respectively. Instead, a model beyond the Rotating Wav
Externí odkaz:
http://arxiv.org/abs/1309.0391
Autor:
Naether, Uta, Martínez, Alejandro J., Guzmán-Silva, Diego, Molina, Mario I., Vicencio, Rodrigo A.
Publikováno v:
Phys Rev E 87, 062914 (2013)
We explore the fundamental question of the critical nonlinearity value needed to dynamically localize energy in discrete nonlinear cubic (Kerr) lattices. We focus on the effective frequency and participation ratio of the profile to determine the tran
Externí odkaz:
http://arxiv.org/abs/1212.2936
Autor:
Guzmán-Silva, Diego, Lou, Cibo, Naether, Uta, Rüter, Christian E., Kip, Detlef, Vicencio, Rodrigo A.
Publikováno v:
Phys. Rev. A 87, 043837 (2013)
We show, theoretically and experimentally, the existence of a multi-stable regime in a nonlinear saturable coupler. In spite of its simplicity, we found that this model shows generic and fundamental properties of extended saturable lattices. The stud
Externí odkaz:
http://arxiv.org/abs/1211.3379