217 citations · 1.7k across the 41 of their papers we have counts for
41 papers
Algebraic localization-delocalization phase transition in moving potential wells on a lattice
Stefano Longhi
The localization and scattering properties of potential wells or barriers uniformly moving on a lattice are strongly dependent on the drift velocity owing to violation of the Galil…
Delocalization of light in photonic lattices with unbounded potentials
Stefano Longhi
In classical mechanics, a particle cannot escape from an unbounded potential well. Naively, one would expect a similar result to hold in wave mechanics, since high barriers make tu…
Non-Hermitian control of localization in mosaic photonic lattices
Stefano Longhi
Exploring the deep insights into localization, disorder, and wave transport in non-Hermitian systems is an emergent area of research of relevance in different areas of physics. Eng…
Inverse Anderson transition in photonic cages
Stefano Longhi
Transport inhibition via Anderson localization is ubiquitous in disordered periodic lattices. However, in crystals displaying only flat bands disorder can lift macroscopic band fla…
Quantum interference and exceptional points
Stefano Longhi
Exceptional points (EPs), i.e. branch point singularities of non-Hermitian Hamiltonians, are ubiquitous in optics. So far, the signatures of EPs have been mostly studied assuming c…
symmetry and anti-symmetry by anti-Hermitian wave coupling and nonlinear optical interactions
Stefano Longhi
Light propagation in systems with anti-Hermitian coupling, described by a spinor-like wave equation, provides a general route for the observation of anti parity-time ($\mathcal{PT}…
Presence of temporal dynamical instabilities in topological insulator lasers
S. Longhi, Y. Kominis, V. Kovanis
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…
Coherent virtual absorption for discretized light
Stefano Longhi
Coherent virtual absorption (CVA) is a recently-introduced phenomenon for which exponentially growing waves incident onto a conservative optical medium are neither reflected nor tr…
Bound states of moving potential wells in discrete wave mechanics
Stefano Longhi
Discrete wave mechanics describes the evolution of classical or matter waves on a lattice, which is governed by a discretized version of the Schrödinger equation. While for a vanis…
Refractionless propagation of discretized light
Stefano Longhi
Light refraction, i.e. the bending of the path of a light wave at the interface between two different dielectric media, is ubiquitous in optics. Refraction arises from the differen…
Rapidly-oscillating scatteringless non-Hermitian potentials and the absence of Kapitza stabilization
Stefano Longhi
In the framework of the ordinary non-relativistic quantum mechanics, it is known that a quantum particle in a rapidly-oscillating bound potential with vanishing time average can be…
Photonic Loschmidt echo in binary waveguide lattices
Stefano Longhi
Time reversal is one of the most intriguing yet elusive wave phenomenon of major interest in different areas of classical and quantum physics. Time reversal requires in principle t…
Non-Hermitian time-dependent perturbation theory: asymmetric transitions and transitionless interactions
S. Longhi, G. Della Valle
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 tr…
Non-Hermitian Floquet invisibility
Stefano Longhi
Wave transport and scattering in open systems can be profoundly affected by non- Hermitian dynamics. In this work we consider wave scattering in a one-dimensional tight-binding lat…
Robust unidirectional transport in a one-dimensional metacrystal with long-range hopping
Stefano Longhi
In two- and three-dimensional structures, topologically-protected chiral edge modes offer a powerful mean to realize robust light transport. However, little attention has been paid…
-symmetric mode-locking
Stefano Longhi
Parity-time () symmetry is one of the most important accomplishments in optics over the past decade. Here the concept of mode-locking of a laser is int…
PT-symmetric quantum oscillator in an optical cavity
Stefano Longhi
The quantum harmonic oscillator with parity-time () symmetry, obtained from the ordinary (Hermitian) quantum harmonic oscillator by an imaginary displacement of the s…
Wave reflection in dielectric media obeying spatial Kramers-Kronig relations
Stefano Longhi
In a recent work, S.A.R. Horsley and coworkers [Nature Photon 9, 436-439 (2015)] showed rather interestingly that planar dielectric media, for which the real and imaginary parts of…
Adiabatic quantum state transfer in tight-binding chains using periodic driving fields
Stefano Longhi
A method for high-fidelity coherent adiabatic transport in a zig-zag tight-binding chain, based on application of two external periodic driving fields, is theoretically proposed. T…
Exceptional points and Bloch oscillations in non-Hermitian lattices with unidirectional hopping
Stefano Longhi
The spectral and transport properties of a non-Hermitian tight-binding lattice with unidirectional hopping are theoretically investigated in three different geometrical settings. I…
Optical lattices with exceptional points in the continuum
S. Longhi, G. Della Valle
The spectral, dynamical and topological properties of physical systems described by non-Hermitian (including -symmetric) Hamiltonians are deeply modified by the appea…
Dynamic localization in Glauber-Fock lattices
S. Longhi, A. Szameit
Glauber-Fock lattices refer to a special class of semi-infinite tight-binding lattices with inhomogeneous hopping rates which are found in certain simple solid-state, quantum optic…
Transparency at the interface between two isospectral crystals
S. Longhi, G. Della Valle
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 qua…
Absence of Floquet scattering in oscillating non-Hermitian potential wells
S. Longhi, G. Della Valle
Scattering of a quantum particle from an oscillating barrier or well does not generally conserve the particle energy owing to energy exchange with the photon field, and an incoming…