Zobrazeno 1 - 10
of 374
pro vyhledávání: '"Arkhipov, A. I."'
We present a method to engineer various zero-energy localized states on disorder-free hypercube graphs. Previous works have already indicated that disorder is not essential for observing localization phenomena in noninteracting systems, with some pro
Externí odkaz:
http://arxiv.org/abs/2410.10763
Publikováno v:
Phys. Rev. Lett. 133, 113802 (2024) [open access]
Non-Hermitian systems have attracted much interest in recent decades, driven partly by the existence of exotic spectral singularities, known as exceptional points (EPs), where the dimensionality of the system evolution operator is reduced. Among vari
Externí odkaz:
http://arxiv.org/abs/2402.15298
Publikováno v:
Nat. Commun. 14, 2076 (2023)
Nontrivial spectral properties of non-Hermitian systems can lead to intriguing effects with no counterparts in Hermitian systems. For instance, in a two-mode photonic system, by dynamically winding around an exceptional point (EP) a controlled asymme
Externí odkaz:
http://arxiv.org/abs/2210.14840
Publikováno v:
Phys. Rev. Research 5, 043092 (2023)
Finite simplex lattice models are used in different branches of science, e.g., in condensed matter physics, when studying frustrated magnetic systems and non-Hermitian localization phenomena; or in chemistry, when describing experiments with mixtures
Externí odkaz:
http://arxiv.org/abs/2206.14779
Publikováno v:
Phys. Rev. A 106, 042210 (2022)
The Exceptional Points (EPs) of non-Hermitian Hamiltonians (NHHs) are spectral degeneracies associated with coalescing eigenvalues and eigenvectors which are associated with remarkable dynamical properties. These EPs can be generated experimentally i
Externí odkaz:
http://arxiv.org/abs/2206.01639
Publikováno v:
Phys. Rev. A 107, 012202 (2023)
Phase transitions in non-Hermitian systems are at the focus of cutting edge theoretical and experimental research. On the one hand, parity-time- ($\cal PT$-) and anti-$\cal PT$-symmetric physics have gained ever-growing interest, due to the existence
Externí odkaz:
http://arxiv.org/abs/2110.15286
The paradigm of second-order phase transitions (PTs) induced by spontaneous symmetry breaking (SSB) in thermal and quantum systems is a pillar of modern physics that has been fruitfully applied to out-of-equilibrium open quantum systems. Dissipative
Externí odkaz:
http://arxiv.org/abs/2110.11902
Phase transitions of thermal systems and the laser threshold were first connected more than forty years ago. Despite the nonequilibrium nature of the laser, the Landau theory of thermal phase transitions, applied directly to the Scully-Lamb laser mod
Externí odkaz:
http://arxiv.org/abs/2103.05625
Publikováno v:
Phys. Rev. A 104, 012205 (2021)
Recently, there has been intense research in proposing and developing various methods for constructing high-order exceptional points (EPs) in dissipative systems. These EPs can possess a number of intriguing properties related to, e.g., chiral transp
Externí odkaz:
http://arxiv.org/abs/2102.13646
We predict the emergence of a time crystal generated by an incoherently driven and dissipative nonlinear optical oscillator, where the nonlinearity also comes from dissipation. We show that a second-order dissipative phase transition of light occurs
Externí odkaz:
http://arxiv.org/abs/2008.08075