Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Ünal, F Nur"'
A two-dimensional periodically driven (Floquet) system with zero winding number in the absence of time-reversal symmetry is usually considered topologically trivial. Here, we study the dynamics of a Gaussian wave packet placed at the boundary of a tw
Externí odkaz:
http://arxiv.org/abs/2412.02086
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
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
Autor:
Martínez, Miguel F., Ünal, F. Nur
Publikováno v:
Phys. Rev. A 108, 063314 (2023)
The possibility of attaining chiral edge modes under periodic driving has spurred tremendous attention, both theoretically and experimentally, especially in light of anomalous Floquet topological phases that feature vanishing Chern numbers unlike any
Externí odkaz:
http://arxiv.org/abs/2302.08485
Publikováno v:
Nature Communications 15, 1144 (2024)
Topological phases of matter span a wide area of research shaping fundamental pursuits and offering promise for future applications. While a significant fraction of topological materials has been characterized using symmetry requirements of wave func
Externí odkaz:
http://arxiv.org/abs/2208.12824
Autor:
Yu, Min, Li, Xiangbei, Chu, Yaoming, Mera, Bruno, Ünal, F. Nur, Yang, Pengcheng, Liu, Yu, Goldman, Nathan, Cai, Jianming
Publikováno v:
National Science Review, 11, nwae065 (2024)
Quantum metrology is deeply connected to quantum geometry, through the fundamental notion of quantum Fisher information. Inspired by advances in topological matter, it was recently suggested that the Berry curvature and Chern numbers of band structur
Externí odkaz:
http://arxiv.org/abs/2206.00546