From frustrated magnetism to spontaneous Chern insulators

We study the behavior of electrons interacting with a classical magnetic background via a strong Hund coupling. The magnetic background results from a Hamiltonian which favors at low temperature the emergence of a phase with nonzero scalar chirality. The strong Hund's coupling combined with the...

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Detalles Bibliográficos
Autores principales:	Rosales, Héctor Diego, Gómez Albarracín, Flavia Alejandra, Pujol, Pierre
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2019
Materias:	Física Magnetic field Physics Topological insulator Electron Hamiltonian (quantum mechanics) Magnetism Fermi energy Condensed matter physics Spins Density of states
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/124892
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-124892
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Física Magnetic field Physics Topological insulator Electron Hamiltonian (quantum mechanics) Magnetism Fermi energy Condensed matter physics Spins Density of states
spellingShingle	Física Magnetic field Physics Topological insulator Electron Hamiltonian (quantum mechanics) Magnetism Fermi energy Condensed matter physics Spins Density of states Rosales, Héctor Diego Gómez Albarracín, Flavia Alejandra Pujol, Pierre From frustrated magnetism to spontaneous Chern insulators
topic_facet	Física Magnetic field Physics Topological insulator Electron Hamiltonian (quantum mechanics) Magnetism Fermi energy Condensed matter physics Spins Density of states
description	We study the behavior of electrons interacting with a classical magnetic background via a strong Hund coupling. The magnetic background results from a Hamiltonian which favors at low temperature the emergence of a phase with nonzero scalar chirality. The strong Hund's coupling combined with the total chirality of the classical spins induces in the electrons an effective flux which results in the realization of a band structure with nonzero Chern number. First, we consider as a magnetic background a classical spin system with spontaneous net chirality. We study the density of states and Hall conductance in order to analyze the topological transitions as a function of the Fermi energy and the temperature of the classical spins. We also study a similar model in which the Chern number of the filled bands can be ``tuned'' with the external magnetic field, resulting in a topological insulator in which the direction of the chiral edge mode can be reverted by reversing the orientation of the magnetic field applied to the classical magnetic system.
format	Articulo Preprint
author	Rosales, Héctor Diego Gómez Albarracín, Flavia Alejandra Pujol, Pierre
author_facet	Rosales, Héctor Diego Gómez Albarracín, Flavia Alejandra Pujol, Pierre
author_sort	Rosales, Héctor Diego
title	From frustrated magnetism to spontaneous Chern insulators
title_short	From frustrated magnetism to spontaneous Chern insulators
title_full	From frustrated magnetism to spontaneous Chern insulators
title_fullStr	From frustrated magnetism to spontaneous Chern insulators
title_full_unstemmed	From frustrated magnetism to spontaneous Chern insulators
title_sort	from frustrated magnetism to spontaneous chern insulators
publishDate	2019
url	http://sedici.unlp.edu.ar/handle/10915/124892
work_keys_str_mv	AT rosaleshectordiego fromfrustratedmagnetismtospontaneouscherninsulators AT gomezalbarracinflaviaalejandra fromfrustratedmagnetismtospontaneouscherninsulators AT pujolpierre fromfrustratedmagnetismtospontaneouscherninsulators
bdutipo_str	Repositorios
_version_	1764820451267182592

From frustrated magnetism to spontaneous Chern insulators

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