Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Viedma, David"'
In flat-band systems with non-orthogonal compact localized states (CLSs), onsite perturbations couple neighboring CLSs and generate exponentially-decaying impurity states, whose degree of localization depends on lattice parameters. In this work, a di
Externí odkaz:
http://arxiv.org/abs/2407.15789
Flat band (FB) systems, i.e., models hosting dispersionless bands in their energy spectrum, have attracted great interest recently. The eigenstates of these FBs can be written as compact localized states (CLSs), meaning states having finite support o
Externí odkaz:
http://arxiv.org/abs/2407.14405
Publikováno v:
Nanophotonics 13(1), 51-61 (2024)
Square-root topology is one of the newest additions to the ever expanding field of topological insulators (TIs). It characterizes systems that relate to their parent TI through the squaring of their Hamiltonians. Extensions to $2^n$-root topology, wh
Externí odkaz:
http://arxiv.org/abs/2307.16855
Publikováno v:
Phys. Rev. A, 107, 023506 (2023)
In this work, we propose a completely general method to pump the gapped topological modes of a lattice of optical waveguides by controlling the propagation constant of an auxiliary waveguide and its coupling to the main lattice. In this way, we can t
Externí odkaz:
http://arxiv.org/abs/2211.08855
Publikováno v:
Opt. Express 30, 23531-23543 (2022)
Making use of the isospectrality of Supersymmetry transformations, we propose a general and high-fidelity method to prepare gapped topological modes in discrete systems from a single-site excitation. The method consists of adiabatically connecting tw
Externí odkaz:
http://arxiv.org/abs/2205.13243
Publikováno v:
Nanophotonics, Vol 13, Iss 1, Pp 51-61 (2024)
Square-root topology is one of the newest additions to the ever expanding field of topological insulators (TIs). It characterizes systems that relate to their parent TI through the squaring of their Hamiltonians. Extensions to 2n-root topology, where
Externí odkaz:
https://doaj.org/article/a5f2ebe0e97144b390f10c66e732f5a1
Publikováno v:
Opt. Express 29, 39200-39213 (2021)
We propose a method to efficiently pump an excited mode of a multimode optical waveguide starting from a fundamental-mode input by combining Stark-Chirped Rapid Adiabatic Passage (SCRAP) and Supersymmetry (SUSY) transformations. In a two-waveguide se
Externí odkaz:
http://arxiv.org/abs/2109.00771
Autor:
Viedma, David, Modugno, Michele
Publikováno v:
Phys. Rev. Research 2, 033478 (2020)
We compare the exact evolution of an expanding three-dimensional Bose-Einstein condensate with that obtained from the effective scaling approach introduced in D. Gu\'ery-Odelin [Phys. Rev. A 66, 033613 (2002)]. This approach, which consists in lookin
Externí odkaz:
http://arxiv.org/abs/2004.03642
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Publikováno v:
Nano-photonics; December 2023, Vol. 13 Issue: 1 p51-61, 11p