Emergence of a Fermionic Finite-Temperature Critical Point in a Kondo Lattice

Po Hao Chou, Liang Jun Zhai, Chung-Hou Chung, Chung Yu Mou, Ting Kuo Lee

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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 TD. At TD, 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 TD.

Original languageEnglish
Article number177002
JournalPhysical Review Letters
Issue number17
StatePublished - 27 Apr 2016

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