Title: Emergence of a Fermionic Finite-Temperature Critical Point in a Kondo Lattice
Authors: Chou, Po-Hao
Zhai, Liang-Jun
Chung, Chung-Hou
Mou, Chung-Yu
Lee, Ting-Kuo
Department of Electrophysics
Issue Date: 27-Apr-2016
Abstract: The underlying Dirac point is central to the profound physics manifested in a wide class of materials. However, it is often difficult to drive a system with Dirac points across the massless fermionic critical point. Here by exploiting screening of local moments under spin-orbit interactions in a Kondo lattice, we show that below the Kondo temperature, the Kondo lattice undergoes a topological transition from a strong topological insulator to a weak topological insulator at a finite temperature T-D. At T-D, massless Dirac points emerge and the Kondo lattice becomes a Dirac semimetal. Our analysis indicates that the emergent relativistic symmetry dictates nontrivial thermal responses over large parameter and temperature regimes. In particular, it yields critical scaling behaviors both in magnetic and transport responses near T-D.
URI: http://dx.doi.org/10.1103/PhysRevLett.116.177002
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.116.177002
Volume: 116
Issue: 17
Appears in Collections:Articles