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Dispersive nodal fermions along grain boundaries in Floquet topological crystals.
Sci Rep
January 2025
Department of Physics, Lehigh University, Bethlehem, Pennsylvania, 18015, USA.
Driven quantum materials often feature emergent topology, otherwise absent in static crystals. Dynamic bulk-boundary correspondence, encoded by nondissipative gapless modes residing near the Floquet zone center and/or boundaries, is its most prominent example. Here we show that topologically robust gapless dispersive modes appear along the grain boundaries, embedded in the interior of Floquet topological crystals, when the Floquet-Bloch band inversion occurring at a finite momentum ( ) and the Burgers vector ( ) of the constituting array of dislocations satisfy (modulo ).
View Article and Find Full Text PDFOptical Zitterbewegung effect in arrays of helical waveguides.
Nanophotonics
November 2024
College of Science, China University of Petroleum (East China), Qingdao 266580, China.
Owing to its topological properties and band collapse, Floquet helical photonic lattices have gained increasing attention as a purely classical setting to realize the optical analogues of a wide variety of quantum phenomena. We demonstrate both theoretically and numerically that light propagation in an appropriately designed helical superlattice can exhibit spatial photonic Zitterbewegung effect, i.e.
View Article and Find Full Text PDFHere we experimentally demonstrate the dynamics of Bloch-Zener oscillations (BZOs) in a synthetic temporal lattice formed by the optical pulses in coupled fiber loops. By periodically modulating the phases imposed to the optical pulses in linear driven lattices, a two-band Floquet system with tunable bandgaps is realized, and the related BZOs that occurred in this system are displayed. On this basis, by manipulating the phase difference and coupling angle of the synthetic lattice, the widths of 0-gap and -gap are tuned feasibly so that a wide variety of the interplays between Bloch oscillations and Landau-Zener tunneling (LZT) are exhibited.
View Article and Find Full Text PDFManipulating the symmetry of photon-dressed electronic states.
Nat Commun
December 2024
Department of Physics, Tsinghua University, Beijing, 100084, People's Republic of China.
Strong light-matter interaction provides opportunities for tailoring the physical properties of quantum materials on the ultrafast timescale by forming photon-dressed electronic states, i.e., Floquet-Bloch states.
View Article and Find Full Text PDFFloquet analysis on an irradiated nodal surface semimetal with non-symmorphic symmetry.
J Phys Condens Matter
December 2024
AKPC Mahavidyalaya, Bengai, West Bengal 712611, India.
A nodal surface semimetal (NSSM) features symmetry enforced band crossings along a surface within the three-dimensional (3D) Brillouin zone (BZ) and a presence of a nonsymmorphic symmetry there pushes such surfaces to stick to the BZ center or boundaries. The topological robustness of the same does not always come with nonzero Berry fluxes. We consider two such NS, one with zero and another with nonzero topological charges and investigate the effect of light irradiation on them.
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