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Time-dependent potential impurity in a topological insulator
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Free Univ Berlin, Inst Expt Phys, Arnimallee 14, D-14195 Berlin, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-9217-2218
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 12, article id 125163Article in journal (Refereed) Published
Abstract [en]

We consider periodically driven potential impurities coupled to the surface states of a two-dimensional topological insulator. The problem is addressed by means of two models, of which the first model is an effective continuum Hamiltonian for the surface states, whereas the Kane-Mele lattice model is our second approach. While both models result in drastic changes in the local density of electron states with increasing amplitude and frequency of the driving field, the linearly low-energy local density of electron states remains in the continuum model, however, with an increased Fermi velocity. The spectrum of the continuum model remains gapless under the emergence of new impurity resonances near the Fermi energy. The Kane-Mele lattice model represents a finite size system, with edge states appearing at the boundary of the system. We, thus, consider the impurity at two different positions, one at the boundary and one at the center of the lattice. In the former case, a reduction and broadening of the low-energy local density of electron states result with increasing amplitude of the driving field. On the other hand, there are no new resonances emerging in the spectrum. In the latter case, the spectrum is gapped both in the absence of the impurity as well as for weak amplitudes of the driving field, while the gap tends to fill up with impurity states with increasing amplitude.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 12, article id 125163
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-395833DOI: 10.1103/PhysRevB.100.125163ISI: 000488258600005OAI: oai:DiVA.org:uu-395833DiVA, id: diva2:1365617
Funder
Swedish Research CouncilStiftelsen Olle Engkvist ByggmästareAvailable from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved

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Pradhan, SaurabhFransson, Jonas

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