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pro vyhledávání: '"Langbein, W"'
The interaction of a quantum system with its environment limits its coherence time. This, in particular, restricts the utility of qubits in quantum information processing applications. In this paper, we show that the decoherence of a coupled qubit sy
Externí odkaz:
http://arxiv.org/abs/2405.14685
Publikováno v:
New J. Phys. 24 103027 (2022)
Solid-state quantum light sources are being intensively investigated for applications in quantum technology. A key challenge is to extract light from host materials with high refractive index, where efficiency is limited by refraction and total inter
Externí odkaz:
http://arxiv.org/abs/2310.06772
Among the wide-bandgap compound semiconductors, gallium nitride is the most widely available material due to its prevalence in the solid state lighting and high-speed/high-power electronics industries. It is now known that GaN is one of only a handfu
Externí odkaz:
http://arxiv.org/abs/2202.06754
Publikováno v:
J. Opt. Soc. Am. B 38, 139 (2021)
Using the resonant-state expansion for leaky optical modes of a planar Bragg microcavity, we investigate the influence of disorder on its fundamental cavity mode. We model the disorder by randomly varying the thickness of the Bragg-pair slabs (compos
Externí odkaz:
http://arxiv.org/abs/2009.03834
Publikováno v:
Phys. Rev. A 100, 063811 (2019)
We present two alternative complete sets of static modes of a homogeneous dielectric sphere, for their use in the resonant-state expansion (RSE), a rigorous perturbative method in electrodynamics. Physically, these modes are needed to correctly descr
Externí odkaz:
http://arxiv.org/abs/1907.07529
Autor:
Scarpelli, L., Lang, B., Masia, F., Beggs, D. M., Muljarov, E. A., Young, A. B., Oulton, R., Kamp, M., Höfling, S., Schneider, C., Langbein, W.
Publikováno v:
Phys. Rev. B 100, 035311 (2019)
Spontaneous emission from excitonic transitions in InAs/GaAs quantum dots embedded in photonic crystal waveguides at 5K into non-guided and guided modes is determined by direct hyperspectral imaging. This enables measurement of the absolute coupling
Externí odkaz:
http://arxiv.org/abs/1905.01198
Publikováno v:
Phys. Rev. A 98, 033820 (2018)
A rigorous method of calculating the electromagnetic field, the scattering matrix, and scattering cross-sections of an arbitrary finite three-dimensional optical system described by its permittivity distribution is presented. The method is based on t
Externí odkaz:
http://arxiv.org/abs/1803.05548
Alzheimer's disease (AD) is a neurodegenerative disorder and the most common cause of dementia in the elderly. The extracellular accumulation of amyloid-$\beta$ (A$\beta$) in senile plaques is a principal event in the pathogenesis and there is growin
Externí odkaz:
http://arxiv.org/abs/1803.01201
Autor:
Langbein, W.
Publikováno v:
Phys. Rev. A 98, 023805 (2018)
Recently, sensors with resonances at exceptional points (EPs) have been suggested to have a vastly improved sensitivity due to the extraordinary scaling of the complex frequency splitting of the $n$ initially degenerate modes with the $n$-th root of
Externí odkaz:
http://arxiv.org/abs/1801.05750
Autor:
Jakubczyk, T., Nogajewski, K., Molas, M. R., Bartos, M., Langbein, W., Potemski, M., Kasprzak, J.
Scientific curiosity to uncover original optical properties and functionalities of atomically thin semiconductors, stemming from unusual Coulomb interactions in the two-dimensional geometry and multi-valley band structure, drives the research on mono
Externí odkaz:
http://arxiv.org/abs/1709.02658