onr:"swepub:oai:DiVA.org:su-94032"
Search: onr:"swepub:oai:DiVA.org:su-94032" > Group theoretical a...
- 1 of 1
- Previous record
- Next record
- To hitlist
Group theoretical and topological analysis of the quantum spin Hall effect in silicene
- Geissler, F. (author)
-
- Budich, Jan Carl (author)
- Stockholms universitet,Fysikum
- Trauzettel, B. (author)
- (creator_code:org_t)
- 2013-08-28
- 2013
- English.
- In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 15
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- Silicene consists of a monolayer of silicon atoms in a buckled honeycomb structure. It was recently discovered that the symmetry of such a system allows for interesting Rashba spin-orbit effects. A perpendicular electric field is able to couple to the sublattice pseudospin, making it possible to electrically tune and close the band gap. Therefore, external electric fields may generate a topological phase transition from a topological insulator to a normal insulator (or semimetal) and vice versa. The contribution of the present paper to the study of silicene is twofold. Firstly, we perform a group theoretical analysis to systematically construct the Hamiltonian in the vicinity of the K points of the Brillouin zone and find an additional, electric field induced spin-orbit term, that is allowed by symmetry. Subsequently, we identify a tight-binding model that corresponds to the group theoretically derived Hamiltonian near the K points. Secondly, we start from this tight-binding model to analyze the topological phase diagram of silicene by an explicit calculation of the Z(2) topological invariant of the band structure. To this end, we calculate the Z(2) topological invariant of the honeycomb lattice in a manifestly gauge invariant way which allows us to include S-z symmetry breaking terms-like Rashba spin-orbit interaction-into the topological analysis. Interestingly, we find that the interplay of a Rashba and an intrinsic spin-orbit term can generate a non-trivial quantum spin Hall phase in silicene. This is in sharp contrast to the more extensively studied honeycomb system graphene where Rashba spin-orbit interaction is known to compete with the quantum spin Hall effect in a detrimental way.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
- New Journal of Physics (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Geissler, F.
- Budich, Jan Carl
- Trauzettel, B.
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Physical Science ...
- Articles in the publication
- New Journal of P ...
- By the university
- Stockholm University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
