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MA: Fachverband Magnetismus

MA 13: Transport: Topological Phases (jointly with DS, MA, HL, O)

MA 13.9: Vortrag

Montag, 20. März 2017, 17:15–17:30, HSZ 304

Solitons in one-dimensional lattices with a flat band — •Dario Bercioux^1,2, Omjyotu Dutta¹, and Enrique Rico^2,3 — ¹Donostia International Physics Center (DIPC), E-20018 San Sebastián, Spain — ²IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain — ³Department of Physical Chemistry, University of the Basque Country UPV/EHU, Apartado 644, E-48080 Bilbao, Spain

We investigate the spectral properties of a quasi-one-dimensional lattices in two possible dimerization configurations [1]. Both configurations are characterized by the same lattice topology and the same spectra containing a flat band at zero energy. We find that, one of the dimerized configuration has similar symmetry to an one-dimensional chain proposed by Su-Schrieffer-Heeger [2] for studying solitons in conjugated polymers. Whereas, the other dimerized configuration only shows non-trivial topological properties in the presence of chiral-symmetry breaking adiabatic pumping.

[1] D. Bercioux, O. Dutta & E. Rico, arXiv:1609.06292.
[2] W. P. Su, J. R. Schrieffer, & A. J. Heeger Phys. Rev. Lett. 42, 1698 (1979).