Zobrazeno 1 - 10
of 262
pro vyhledávání: '"Wiersig, Jan"'
Autor:
Binkowski, Felix, Kullig, Julius, Betz, Fridtjof, Zschiedrich, Lin, Walther, Andrea, Wiersig, Jan, Burger, Sven
Publikováno v:
Phys. Rev. Research 6, 023148 (2024)
Exceptional points are spectral degeneracies of non-Hermitian systems where both eigenfrequencies and eigenmodes coalesce. The eigenfrequency sensitivities near an exceptional point are significantly enhanced, whereby they diverge directly at the exc
Externí odkaz:
http://arxiv.org/abs/2402.17648
Autor:
Wiersig, Jan
Publikováno v:
Phys. Rev. A 108, 033501 (2023)
Open systems with non-Hermitian degeneracies called exceptional points show a significantly enhanced response to perturbations in terms of large energy splittings induced by a small perturbation. This reaction can be quantified by the spectral respon
Externí odkaz:
http://arxiv.org/abs/2306.10851
Autor:
Wiersig, Jan
Publikováno v:
Phys. Rev. Research 5, 033042 (2023)
The Petermann factor and the phase rigidity are convenient measures for various aspects of open quantum and wave systems, such as the sensitivity of energy eigenvalues to perturbations or the magnitude of quantum excess noise in lasers. We discuss th
Externí odkaz:
http://arxiv.org/abs/2304.00764
Autor:
Jiang, Xuefeng, Yin, Shixiong, Li, Huanan, Quan, Jiamin, Cotrufo, Michele, Kullig, Julius, Wiersig, Jan, Alù, Andrea
Non-Hermitian wave engineering has attracted a surge of interest in photonics in recent years. One of the prominent phenomena is coherent perfect absorption (CPA), in which the annihilation of electromagnetic scattering occurs by destructive interfer
Externí odkaz:
http://arxiv.org/abs/2211.08727
Autor:
Wiersig, Jan
Publikováno v:
Phys. Rev. A 106, 063526 (2022)
Higher-order exceptional points in the spectrum of non-Hermitian Hamiltonians describing open quantum or wave systems have a variety of potential applications in particular in optics and photonics. However, the experimental realization is notoriously
Externí odkaz:
http://arxiv.org/abs/2210.04459
Autor:
Wiersig, Jan
Exceptional points are non-Hermitian degeneracies in open quantum and wave systems at which not only eigenenergies but also the corresponding eigenstates coalesce. This is in strong contrast to degeneracies known from conservative systems, so-called
Externí odkaz:
http://arxiv.org/abs/2205.15685
Autor:
Wiersig, Jan
Publikováno v:
Phys. Rev. Research 4, 023121 (2022)
Open quantum and wave systems exhibit exotic degeneracies at exceptional points in parameter space that have attracted considerable attention in various fields of physics, including optics and photonics. One reason is the strong response of open syst
Externí odkaz:
http://arxiv.org/abs/2203.12920
Autor:
Wiersig, Jan
Publikováno v:
Phys. Rev. A 101, 053846 (2020)
Recent experiments have demonstrated the feasibility of exploiting spectral singularities in open quantum and wave systems, so-called exceptional points, for sensors with strongly enhanced sensitivity. Here, we study theoretically the influence of cl
Externí odkaz:
http://arxiv.org/abs/2003.02222
Publikováno v:
Phys. Rev. A 102, 012212 (2020)
We analyze the scattering dynamics and spectrum of a quantum particle on a tight-binding lattice subject to a non-Hermitian (purely imaginary) local potential. The reflection, transmission and absorption coefficients are studied as a function of the
Externí odkaz:
http://arxiv.org/abs/1910.07439
Autor:
Wiersig, Jan
Publikováno v:
Phys. Rev. Research 1, 033182 (2019)
It is known that the overlap of two energy eigenstates in a decaying quantum system is bounded from above by a function of the energy detuning and the individual decay rates. This is usually traced back to the positive definiteness of an appropriatel
Externí odkaz:
http://arxiv.org/abs/1909.13547