Zobrazeno 1 - 10
of 514
pro vyhledávání: '"F. Nur"'
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-11 (2024)
Abstract While a significant fraction of topological materials has been characterized using symmetry requirements1–4, the past two years have witnessed the rise of novel multi-gap dependent topological states5–9, the properties of which go beyond
Externí odkaz:
https://doaj.org/article/114f4ef19fdf43a9aa3003c082089aac
We demonstrate that periodically driven quantum rotors provide a promising and broadly applicable platform to implement multi-gap topological phases, where groups of bands can acquire topological invariants due to non-Abelian braiding of band degener
Externí odkaz:
http://arxiv.org/abs/2408.16848
Quantum Hall states are characterized by a topological invariant, the many-body Chern number, which determines the quantized value of the Hall conductivity. Interestingly, this topological property can also be accessed through a dissipative response,
Externí odkaz:
http://arxiv.org/abs/2407.04639
Autor:
Jankowski, Wojciech J., Morris, Arthur S., Davoyan, Zory, Bouhon, Adrien, Ünal, F. Nur, Slager, Robert-Jan
Publikováno v:
Phys. Rev. B 110, 075135 (2024)
We discuss a class of three-band non-Abelian topological insulators in three dimensions that carry a single bulk Hopf index protected by spatiotemporal ($\mathcal{PT}$) inversion symmetry. These phases may also host subdimensional topological invaria
Externí odkaz:
http://arxiv.org/abs/2405.17305
Autor:
Matthias Tarnowski, F. Nur Ünal, Nick Fläschner, Benno S. Rem, André Eckardt, Klaus Sengstock, Christof Weitenberg
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-13 (2019)
The connection between the topological properties of the ground state and non-equilibrium dynamics remains obscure. Here, Tarnowski et al. define and measure a linking number between static and dynamical vortices, which directly corresponds to the gr
Externí odkaz:
https://doaj.org/article/2f4cab30e3fc47d1b518e04fea4016fe
Publikováno v:
Physical Review Research, Vol 4, Iss 2, p 023120 (2022)
The geometric interpretation of (pseudo)spin-1/2 systems on the Bloch sphere has been appreciated across different areas ranging from condensed matter to quantum information and high-energy physics. Although similar notions for larger Hilbert spaces
Externí odkaz:
https://doaj.org/article/8f47ad90a0b44a28801c39177d67fd22
Publikováno v:
Phys. Rev. Lett. 133, 093404 (2024)
In systems with a real Bloch Hamiltonian band nodes can be characterised by a non-Abelian frame-rotation charge. The ability of these band nodes to annihilate pairwise is path dependent, since by braiding nodes in adjacent gaps the sign of their char
Externí odkaz:
http://arxiv.org/abs/2401.01928
We analyze quantum-geometric bounds on optical weights in topological phases with pairs of bands hosting non-trivial Euler class, a multi-gap invariant characterizing non-Abelian band topology. We show how the bounds constrain the combined optical we
Externí odkaz:
http://arxiv.org/abs/2311.07545
We comment on the recent paper ``Floquet non-Abelian topological insulator and multifold bulk-edge correspondence" by Tianyu Li and Haiping Hu, Nat. Comm. {\bf 14}, 6418 (2023). Apart from the fact that the authors unjustly imply to study multi-gap t
Externí odkaz:
http://arxiv.org/abs/2310.12782
Publikováno v:
Quantum Science and Technology, vol. 9, no. 4, 045030, August 2024
Ultracold atoms in optical lattices have emerged as powerful quantum simulators of translationally invariant systems with many applications in e.g.\ strongly-correlated and topological systems. However, the ability to locally tune all Hamiltonian par
Externí odkaz:
http://arxiv.org/abs/2309.12124