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Half-integer anomalous currents in 2D materials from a QFT viewpoint

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Author(s):
Dudal, David ; Matusalem, Filipe ; Mizher, Ana Julia ; Rocha, Alexandre Reily ; Villavicencio, Cristian
Total Authors: 5
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 12, n. 1, p. 10-pg., 2022-03-31.
Abstract

Charge carriers in Dirac/Weyl semi-metals exhibit a relativistic-like behavior. In this work we propose a novel type of intrinsic half-integer Quantum Hall effect in 2D materials, thereby also offering a topological protection mechanism for the current. Its existence is rooted in the 2D parity anomaly, without any need for a perpendicular magnetic field. We conjecture that it may occur in disturbed honeycomb lattices where both spin degeneracy and time reversal symmetry are broken. These configurations harbor two distinct gap-opening mechanisms that, when occurring simultaneously, drive slightly different gaps in each valley, causing a net anomalous conductivity when the chemical potential is tuned to be between the distinct gaps. Some examples of promising material setups that fulfill the prerequisites of our proposal are also listed to motivate looking for the effect at the numerical and experimental level. (AU)

FAPESP's process: 17/02317-2 - Interfaces in materials: electronic, magnetic, structural and transport properties
Grantee:Adalberto Fazzio
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 20/06896-0 - Atomistic modeling of the condensed phases of water
Grantee:Filipe Matusalém de Souza
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 16/01343-7 - ICTP South American Institute for Fundamental Research: a regional center for theoretical physics
Grantee:Nathan Jacob Berkovits
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/12705-7 - Magnetic fields in heavy ion collisions: effects on obserbables
Grantee:Ana Júlia Silveira Mizher
Support Opportunities: Scholarships in Brazil - Post-Doctoral