Zobrazeno 1 - 10
of 4 701
pro vyhledávání: '"Koenig, J"'
Autor:
Wang, Kunkun, König, J. Lukas K., Yang, Kang, Xiao, Lei, Yi, Wei, Bergholtz, Emil J., Xue, Peng
Monopoles and braids are exotic but elusive aspects of fundamental theories of light and matter. In lattice systems, monopoles of band-structure degeneracies are subject to well-established no-go (doubling) theorems that appear to universally apply i
Externí odkaz:
http://arxiv.org/abs/2410.08191
Despite their ubiquity, systematic characterization of multifold exceptional points, $n$-fold exceptional points (EP$n$s), remains a significant unsolved problem. In this article, we characterize Abelian topology of eigenvalues for generic EP$n$s and
Externí odkaz:
http://arxiv.org/abs/2409.09153
Publikováno v:
Appl. Phys. Lett. 124, 051109 (2024)
Symmetry and non-Hermiticity play pivotal roles in photonic lattices. While symmetries such as parity-time ($\mathcal{PT}$) symmetry have attracted ample attention, more intricate crystalline symmetries have been neglected in comparison. Here, we inv
Externí odkaz:
http://arxiv.org/abs/2310.18269
Autor:
Yang, Kang, Li, Zhi, König, J. Lukas K., Rødland, Lukas, Stålhammar, Marcus, Bergholtz, Emil J.
Publikováno v:
Rep. Prog. Phys. 87 078002 (2024)
Non-Hermitian matrices are ubiquitous in the description of nature ranging from classical dissipative systems, including optical, electrical, and mechanical metamaterials, to scattering of waves and open quantum many-body systems. Seminal line-gap an
Externí odkaz:
http://arxiv.org/abs/2309.14416
We propose the usage of wavefront shaping approaches for image correlation based flow-field measurements. Aberrations introduced by a single phase boundary in the detection beam path were explored. Variations of the optical path-length result in stro
Externí odkaz:
https://tud.qucosa.de/id/qucosa%3A35104
https://tud.qucosa.de/api/qucosa%3A35104/attachment/ATT-0/
https://tud.qucosa.de/api/qucosa%3A35104/attachment/ATT-0/
The biorthogonal formalism extends conventional quantum mechanics to the non-Hermitian realm. It has, however, been pointed out that the biorthogonal inner product changes with the scaling of the eigenvectors, an ambiguity whose physical significance
Externí odkaz:
http://arxiv.org/abs/2212.06004
Publikováno v:
Phys. Rev. Research 5 (2023) L042010
We demonstrate the existence of topologically stable unpaired exceptional points (EPs), and construct simple non-Hermitian (NH) tight-binding models exemplifying such remarkable nodal phases. While fermion doubling, i.e. the necessity of compensating
Externí odkaz:
http://arxiv.org/abs/2211.05788
Publikováno v:
In Journal of Affective Disorders 15 September 2024 361:465-471
Publikováno v:
Phys. Rev. Research 4, L032045 (2022)
We investigate whether and how the quantum Zeno effect, i.e., the inhibition of quantum evolution by frequent measurements, can be employed to isolate a quantum dot from its surrounding electron reservoir. In contrast to the often studied case of tun
Externí odkaz:
http://arxiv.org/abs/2201.11718
Autor:
Jafari, S. A., König, J.
We predict the existence of an undamped collective spin excitation in doped graphene in the paramagnetic regime, referred to as paramagnons. Since the electrons and the holes involved in this collective mode reside in different valleys of the band st
Externí odkaz:
http://arxiv.org/abs/2201.04870