Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Herman, František"'
Nowadays superconducting radio frequency (SRF) cavities represent fundamental tools used for (Standard Model) particle acceleration, (beyond Standard Model) particle probing and long-lifetime photon preservation. We study the SRF frequency shift in t
Externí odkaz:
http://arxiv.org/abs/2409.04203
We study the energy gap $\Delta(T)$ within the Dynes superconductor theory. This model generalizes the Bardeen-Cooper-Schrieffer (BCS) approach by including the pair-breaking scattering, introducing the tunneling in-gap states up to a Fermi level. We
Externí odkaz:
http://arxiv.org/abs/2408.08966
Autor:
Herman, František, Hlubina, Richard
The size of the Cooper pair $\xi_{\rm pair}$ is one of the basic characteristics of a superconductor, but it is not possible to measure it directly. It might be argued that $\xi_{\rm pair}$ can be determined from the value $\xi_{\rm slope}$ extracted
Externí odkaz:
http://arxiv.org/abs/2310.06220
Autor:
Herman, František
An advanced theoretical framework is introduced and examined. Its main idea is to extract properties of the superconducting pairing gap function $\Delta(\omega)$ in the conventional, nearly localized superconductors. To test the approach, we present
Externí odkaz:
http://arxiv.org/abs/2212.13580
Autor:
Bucko, Jozef, Schäfer, Frank, Herman, František, Garreis, Rebekka, Tong, Chuyao, Kurzmann, Annika, Ihn, Thomas, Greplova, Eliska
Bilayer graphene is a nanomaterial that allows for well-defined, separated quantum states to be defined by electrostatic gating and, therefore, provides an attractive platform to construct tunable quantum dots. When a magnetic field perpendicular to
Externí odkaz:
http://arxiv.org/abs/2203.00697
The gap function $\Delta(\omega)$ carries essential information on both, the pairing glue as well as the pair-breaking processes in a superconductor. Unfortunately, in nearly localized superconductors with a non-constant density of states in the norm
Externí odkaz:
http://arxiv.org/abs/2112.09731
Autor:
Bucko, Jozef, Herman, František
Recent exploration of the commensurate structure in the turbostratic double layer graphene shows that the large angle twisting can be treated by the decrease of the effective velocity within the energy spectra of the single layer graphene. Within our
Externí odkaz:
http://arxiv.org/abs/2101.11698
Autor:
Xu, Yang, Herman, František, Granata, Veronica, Destraz, Daniel, Das, Lakshmi, Vonka, Jakub, Gerber, Simon, Spring, Jonathan, Gibert, Marta, Schilling, Andreas, Zhang, Xiaofu, Li, Shiyan, Fittipaldi, Rosalba, Fischer, Mark H., Vecchione, Antonio, Chang, Johan
Publikováno v:
Commun. Phys. 4, 1 (2021)
Tuning of electronic density-of-states singularities is a common route to unconventional metal physics. Conceptually, van Hove singularities are realized only in clean two-dimensional systems. Little attention has therefore been given to the disorder
Externí odkaz:
http://arxiv.org/abs/2005.00873
Publikováno v:
Phys. Rev. B 99, 184107 (2019)
Recent experiments revealed non-Fermi-liquid resistivity in the unconventional superconductor Sr$_{2}$RuO$_{4}$ when strain pushes one of the Fermi surfaces close to a van Hove singularity. The origin of this behavior and whether it can be understood
Externí odkaz:
http://arxiv.org/abs/1903.04000
Autor:
Eich, Marius, Herman, František, Pisoni, Riccardo, Overweg, Hiske, Kurzmann, Annika, Lee, Yongjin, Rickhaus, Peter, Watanabe, Kenji, Taniguchi, Takashi, Sigrist, Manfred, Ihn, Thomas, Ensslin, Klaus
Publikováno v:
Phys. Rev. X 8, 031023 (2018)
In bilayer graphene, electrostatic confinement can be realized by a suitable design of top and back gate electrodes. We measure electronic transport through a bilayer graphene quantum dot, which is laterally confined by gapped regions and connected t
Externí odkaz:
http://arxiv.org/abs/1803.02923