Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session X03: Topological Superconductors and Superfluids
8:00 AM–10:36 AM,
Friday, March 8, 2019
BCEC
Room: 107B
Sponsoring
Unit:
DCMP
Abstract: X03.00009 : Conformal phase transition in topological superconductors
9:36 AM–9:48 AM
Presenter:
Flavio Nogueira
(IFW Dresden)
Authors:
Flavio Nogueira
(IFW Dresden)
Jeroen Van den Brink
(IFW Dresden)
Asle Sudbo
(Dept. of Physics, Norwegian University of Science and Technology)
correlation length, but which nevertheless exhibits a universal jump in some generalized stiffness of the system. A well-known example is the Berezinskii-Kosterlitz-Thouless (BKT) phase transition taking place in two-dimensional superfluids and superconductors when they transition from the low-tenperature phase to the normal state, and in the melting transition of two-dimensional crystals. In this talk we will introduce a more subtle type of CPT, one that is driven by a topological term in the effective action in 2+1dimensions. The main motivation comes from the modification of Maxwell electrodynamics in topological insulators and superconductors. Quite generally, the surface of a topological insulator features an electromagnetic response characterized by a Chern-Simons term in the Lagrangian. We will show in this context that a topological Abelian Higgs model exhibits quantum criticality with BKT scaling when the Hall conductivity lies in a well defined interval where conformality is lost. We explore the physical consequances of this novel quantum critical phenomenon in topological materials.
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