English

Manipulating Z2 and Chern topological phases in a single material using periodically driving fields

Mesoscale and Nanoscale Physics 2016-03-15 v1 Materials Science

Abstract

Z2Z_{2} and Chern topological phases such as newly discovered quantum spin Hall and original quantum Hall states hardly both co--exist in a single material due to their contradictory requirement on the time--reversal symmetry (TRS). We show that although the TRS is broken in systems with a periodically driving ac-field, an effective TRS can still be defined provided the ac--field is linearly polarized or certain other conditions are satisfied. The controllable TRS provides us with a route to manipulate Z2Z_{2} and Chern topological phases in a single material by tuning the polarization of the ac--field. To demonstrate the idea, we consider a generic honeycomb lattice model as a benchmark system that is relevant to electronic structures of several monolayered materials. Our calculation shows that not only the transitions between Z2Z_{2} and Chern phases can be induced but also features such as the dispersion of the edge states can be controlled. This opens the possibility of manipulating various topological phases in a single material and can be a promising approach to engineer some new electronic states of matter.

Keywords

Cite

@article{arxiv.1507.08330,
  title  = {Manipulating Z2 and Chern topological phases in a single material using periodically driving fields},
  author = {Shu-Ting Pi and Sergey Savrasov},
  journal= {arXiv preprint arXiv:1507.08330},
  year   = {2016}
}

Comments

5 pages, 3 figures, 1 supplementary material (2 pages)

R2 v1 2026-06-22T10:21:57.953Z