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Analysis of complex excitation patterns using Feynman-like diagrams.
Sci Rep
November 2024
Department of Mathematics, KU Leuven Campus Kortrijk (KULAK), Etienne Sabbelaan 53, 8500, Kortrijk, Belgium.
Many extended chemical and biological systems self-organise into complex patterns that drive the medium behaviour in a non-linear fashion. An important class of such systems are excitable media, including neural and cardiac tissues. In extended excitable media, wave breaks can form rotating patterns and turbulence.
View Article and Find Full Text PDFSignatures of hybridization of multiple Majorana zero modes in a vortex.
Nature
September 2024
Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Tsung-Dao Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China.
Majorana zero modes (MZMs) are emergent zero-energy topological quasiparticles that are their own antiparticles. Detected MZMs are spatially separated and electrically neutral, so producing hybridization between MZMs is extremely challenging in superconductors. Here, we report the magnetic field response of vortex bound states in superconducting topological crystalline insulator SnTe (001) films.
View Article and Find Full Text PDFTheory of topological exciton insulators and condensates in flat Chern bands.
Proc Natl Acad Sci U S A
August 2024
Department of Physics and Astronomy, Center for Quantum Research and Technology, University of Oklahoma, Norman, OK 73069.
Excitons are the neutral quasiparticles that form when Coulomb interactions create bound states between electrons and holes. Due to their bosonic nature, excitons are expected to condense and exhibit superfluidity at sufficiently low temperatures. In interacting Chern insulators, excitons may inherit the nontrivial topology and quantum geometry from the underlying electron wavefunctions.
View Article and Find Full Text PDFPicosecond Trajectory of Two-Dimensional Vortex Motion in FeSe_{0.5}Te_{0.5} Visualized by Terahertz Second Harmonic Generation.
Phys Rev Lett
July 2024
Cryogenic Research Center, University of Tokyo, Bunkyo, Tokyo 113-0032, Japan.
We have investigated the vortex dynamics in a thin film of an iron-based superconductor FeSe_{0.5}Te_{0.5} by observing second-harmonic generation (SHG) in the terahertz frequency range.
View Article and Find Full Text PDFWe report an experimental approach to produce spatially localized photoinduced superconducting state in a cuprate superconductor using optical vortices with ultrafast pulses. The measurements were carried out using coaxially aligned three-pulse time-resolved spectroscopy, in which an intense vortex pulse was used for coherent quenching of superconductivity and the resulting spatially modulated metastable states were analyzed by the pump-probe spectroscopy. The transient response after quenching shows a spatially localized superconducting state that remains unquenched at the dark core of the vortex beam for a few picoseconds.
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