Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Yuce, Cem"'
Scale-free localization in non-Hermitian systems is a distinctive type of localization where the localization length of certain eigenstates, known as scale-free localized (SFL) states, scales proportionally with the system size. Unlike skin states, w
Externí odkaz:
http://arxiv.org/abs/2411.00389
Topological edge states arise at the interface of two topologically-distinct structures and have two distinct features: they are localized and robust against symmetry protecting disorder. On the other hand, conventional transport in one dimension is
Externí odkaz:
http://arxiv.org/abs/2205.02181
Autor:
Yuce, Cem, Ramezani, Hamidreza
In one-dimensional Hermitian tight-binding models, mobility edges separating extended and localized states can appear in the presence of properly engineered quasi-periodical potentials and coupling constants. On the other hand, mobility edges don't e
Externí odkaz:
http://arxiv.org/abs/2203.02129
We propose a metallic-silicon system with a complex optical potential modulated along the length of the waveguide for a robust higher harmonic generation. For right moving fields when the strength of non-Hermiticity becomes equal to the real part of
Externí odkaz:
http://arxiv.org/abs/2201.07663
Autor:
Yuce, Cem, Ramezani, Hamidreza
We construct localized beams that are located at the edge of a non-Hermitian Glauber Fock (NGF) lattice made of coupled waveguides and can propagate for a long distance without almost no diffraction. Specifically, we calculate the closed-form of the
Externí odkaz:
http://arxiv.org/abs/2009.12880
Autor:
Yuce, Cem, Ramezani, Hamidreza
We propose to use exceptional points (EPs) to construct diffraction-free beam propagation and localized power oscillation in lattices. Specifically, here we propose two systems to utilize EPs for diffraction-free beam propagation, one in synthetic ga
Externí odkaz:
http://arxiv.org/abs/2009.12876
Autor:
Yuce, Cem
Publikováno v:
Phys. Rev. A 102, 032203 (2020)
We propose an idea of eigenstate clustering in non-Hermitian systems. We show that non-orthogonal eigenstates can be clustered around exceptional points and illustrate our idea on some models. We discuss that exponential localization of eigenstates a
Externí odkaz:
http://arxiv.org/abs/2008.04929
Autor:
Mostafavi, Fatemeh, Yuce, Cem, Magana-Loaiza, Omar S., Schomerus, Henning, Ramezani, Hamidreza
Publikováno v:
Phys. Rev. Research 2, 032057 (2020)
We demonstrate the creation of robust localized zero-energy states that are induced into topologically trivial systems by insertion of a PT-symmetric defect with local gain and loss. A pair of robust localized states induced by the defect turns into
Externí odkaz:
http://arxiv.org/abs/2006.04264
Autor:
Yuce, Cem, Ramezani, Hamidreza
We construct a theory to introduce the concept of topologically robust exceptional points (EP). Starting from an ordered system with $N$ elements, we find the necessary condition to have the highest order exceptional point, namely $N^\text{th}$ order
Externí odkaz:
http://arxiv.org/abs/1812.02218
Autor:
Yuce, Cem
Publikováno v:
Phys. Lett. A 379, 1213 (2015)
In this work, we consider a tight binding lattice with two non-Hermitian impurities. The system is described by a non-Hermitian generalization of the Aubry Andre model. We show for the first time that there exists topologically nontrivial edge states
Externí odkaz:
http://arxiv.org/abs/1502.07160