Zobrazeno 1 - 10
of 2 948
pro vyhledávání: '"LONGHI, S."'
Autor:
Longhi, S., Pinotti, E.
Publikováno v:
EPL 125, 10006 (2019)
We consider wave dynamics for a Schr\"odinger equation with a non-Hermitian Hamiltonian $\mathcal{H}$ satisfying the generalized (anyonic) parity-time symmetry $\mathcal{PT H}= \exp(2 i \varphi) \mathcal{HPT}$, where $\mathcal{P}$ and $ \mathcal{T}$
Externí odkaz:
http://arxiv.org/abs/1812.09462
Topological insulator lasers are a newly introduced kind of lasers in which light snakes around a cavity without scattering. Like for an electron current in a topological insulator material, a topologically protected lasing mode travels along the cav
Externí odkaz:
http://arxiv.org/abs/1804.06553
Wave-packet scattering from a stationary potential is significantly modified when the wave-packet is subject to an external time-dependent force during the interaction. In the semiclassical limit, wave--packet motion is simply described by Newtonian
Externí odkaz:
http://arxiv.org/abs/1803.04634
Autor:
Longhi, S., Feng, L.
Publikováno v:
APL Photonics 3, 060802 (2018)
Arrays of coupled semiconductor lasers are systems possessing complex dynamical behavior that are of major interest in photonics and laser science. Dynamical instabilities, arising from supermode competition and slow carrier dynamics, are known to pr
Externí odkaz:
http://arxiv.org/abs/1802.05439
Autor:
Longhi, S., Della Valle, G.
The ordinary time-dependent perturbation theory of quantum mechanics, that describes the interaction of a stationary system with a time-dependent perturbation, predicts that the transition probabilities induced by the perturbation are symmetric with
Externí odkaz:
http://arxiv.org/abs/1706.06785
Autor:
Longhi, S., Della Valle, G.
Publikováno v:
Phys. Rev. A 89, 052132 (2014)
The spectral, dynamical and topological properties of physical systems described by non-Hermitian (including $\mathcal{PT}$-symmetric) Hamiltonians are deeply modified by the appearance of exceptional points and spectral singularities. Here we show t
Externí odkaz:
http://arxiv.org/abs/1402.3764
Publikováno v:
Phys. Rev. A 89, 023840 (2014)
We study analytically and numerically an optical analogue of tachyon condensation in amplifying plasmonic arrays. Optical propagation is modeled through coupled-mode equations, which in the continuous limit can be converted into a nonlinear one-dimen
Externí odkaz:
http://arxiv.org/abs/1309.2261
Publikováno v:
Phys. Rev. Lett. 111, 220403 (2013)
We introduce and experimentally demonstrate a class of surface bound states with algebraic decay in a one-dimensional tight-binding lattice. Such states have an energy embedded in the spectrum of scattered states and are structurally stable against p
Externí odkaz:
http://arxiv.org/abs/1306.3405
Autor:
Longhi, S., Della Valle, G.
Publikováno v:
Phys. Rev. A 87, 013634 (2013)
The hopping dynamics of two fermionic species with different effective masses in the one-dimensional Hubbard model driven by an external field is theoretically investigated. A multiple-time-scale asymptotic analysis of the driven asymmetric Hubbard m
Externí odkaz:
http://arxiv.org/abs/1306.0678
Autor:
Longhi, S., Della Valle, G.
Publikováno v:
EPL, 102 (2013) 40008
Reflection at an interface separating two different media is a rather universal phenomenon which arises because of wave mismatching at the interface. By means of supersymmetric quantum mechanics methods, it is shown that a fully transparent interface
Externí odkaz:
http://arxiv.org/abs/1306.0677