Details

Autor(en) / Beteiligte

• Isobe, Hiroki
• Yang, Bohm-Jung
• Chubukov, Andrey
• Schmalian, Jörg
• Nagaosa, Naoto

Titel

Emergent Non-Fermi-Liquid at the Quantum Critical Point of a Topological Phase Transition in Two Dimensions

Ist Teil von

• Physical review letters, 2016-02, Vol.116 (7), p.076803-076803, Article 076803

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2016

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We study the effects of Coulomb interaction between 2D Weyl fermions with anisotropic dispersion which displays relativistic dynamics along one direction and nonrelativistic dynamics along the other. Such a dispersion can be realized in phosphorene under electric field or strain, in TiO_{2}/VO_{2} superlattices, and, more generally, at the quantum critical point between a nodal semimetal and an insulator in systems with a chiral symmetry. Using the one-loop renormalization group approach in combination with the large-N expansion, we find that the system displays interaction-driven non-Fermi liquid behavior in a wide range of intermediate frequencies and marginal Fermi liquid behavior at the smallest frequencies. In the non-Fermi liquid regime, the quasiparticle residue Z at energy E scales as Z∝E^{a} with a>0, and the parameters of the fermionic dispersion acquire anomalous dimensions. In the marginal Fermi-liquid regime, Z∝(|logE|)^{-b} with universal b=3/2.