Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session S56: Topology and Correlations
11:15 AM–2:03 PM,
Thursday, March 5, 2020
Room: Mile High Ballroom 2C
Sponsoring Unit: DCMP
Chair: Narayan Poudel, Idaho National Laboratory
Abstract: S56.00005 : Local and Non-local correlation effects in topological quantum phase transitions
(Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg)
We study the effects of electronic interactions at the local and non-local level in a paradigmatic model for topological insulator in two dimensions.
In the non-interacting regime topological transitions occurs via the continuous closing the energy gap.
Using Dynamical Mean-Field Theory and various cluster extensions (Cluster-DMFT, Variational Cluster Approximation, etc.), we show how short-range correlation effects are responsible for the breakdown of the continuous topological transition in favour of a first-order one. The discontinuous transition occurs without the celebrated closing of the energy gap, yet without the breaking of the symmetries which protect the topological state.
A. Amaricci, J. C. Budich, M. Capone, B. Trauzettel, and G. Sangiovanni, Phys. Rev. Lett. 114, 185701 (2015)
A. Amaricci, J. C. Budich, M. Capone, B. Trauzettel, and G. Sangiovanni, Phys. Rev. B 93, 235112 (2016)
L. Crippa, A. Amaricci, N. Wagner, G. Sangiovanni, J. C. Budich, and M. Capone,arXiv:1904.11836 (2019)
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