Colossal anisotropy in diluted magnetic topological insulators
Identifieur interne : 001F26 ( Main/Repository ); précédent : 001F25; suivant : 001F27Colossal anisotropy in diluted magnetic topological insulators
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Abstract
We consider dilute magnetic doping in the surface of a three dimensional topological insulator where a two dimensional Dirac electron gas resides. We find that exchange coupling between magnetic atoms and the Dirac electrons has a strong and peculiar effect on both. First, the exchange-induced single ion magnetic anisotropy is very large and favors off-plane orientation. In the case of a ferromagnetically ordered phase, we find a colossal magnetic anisotropy energy, of the order of the critical temperature. Second, a persistent electronic current circulates around the magnetic atom and, in the case of a ferromagnetic phase, around the edges of the surface.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Colossal anisotropy in diluted magnetic topological insulators</title><author><name sortKey="Nunez, A S" uniqKey="Nunez A">A. S. Nunez</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile</s1><s2>Casilla 487-3, Santiago</s2><s3>CHL</s3><sZ>1 aut.</sZ></inist:fA14><country>Chili</country><wicri:noRegion>Casilla 487-3, Santiago</wicri:noRegion></affiliation></author><author><name sortKey="Fernandez Rossier, J" uniqKey="Fernandez Rossier J">J. Fernandez-Rossier</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Departamento de Física Aplicada, Universidad de Alicante, San Vicente del Raspeig</s1><s3>ESP</s3><sZ>2 aut.</sZ></inist:fA14><country>Espagne</country><wicri:noRegion>Departamento de Física Aplicada, Universidad de Alicante, San Vicente del Raspeig</wicri:noRegion><orgName type="university">Université d'Alicante</orgName><placeName><settlement type="city">Alicante</settlement><region nuts="2" type="region">Communauté valencienne</region></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga</s1><s2>4715-330 Braga</s2><s3>PRT</s3><sZ>2 aut.</sZ></inist:fA14><country>Portugal</country><wicri:noRegion>4715-330 Braga</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">12-0147985</idno><date when="2012">2012</date><idno type="stanalyst">PASCAL 12-0147985 INIST</idno><idno type="RBID">Pascal:12-0147985</idno><idno type="wicri:Area/Main/Corpus">002001</idno><idno type="wicri:Area/Main/Repository">001F26</idno></publicationStmt><seriesStmt><idno type="ISSN">0038-1098</idno><title level="j" type="abbreviated">Solid state commun.</title><title level="j" type="main">Solid state communications</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Critical points</term><term>Dirac equation</term><term>Electron gas</term><term>Exchange interactions</term><term>Ferromagnetism</term><term>Indium additions</term><term>Magnetic anisotropy</term><term>Magnetic impurities</term><term>Persistent currents</term><term>Semimagnetic semiconductors</term><term>Topological insulator</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Anisotropie magnétique</term><term>Addition indium</term><term>Interaction échange</term><term>Impureté magnétique</term><term>Ferromagnétisme</term><term>Point critique</term><term>Courant persistent</term><term>Equation Dirac</term><term>Gaz électron</term><term>Semiconducteur semimagnétique</term><term>CaSe</term><term>Isolant topologique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We consider dilute magnetic doping in the surface of a three dimensional topological insulator where a two dimensional Dirac electron gas resides. We find that exchange coupling between magnetic atoms and the Dirac electrons has a strong and peculiar effect on both. First, the exchange-induced single ion magnetic anisotropy is very large and favors off-plane orientation. In the case of a ferromagnetically ordered phase, we find a colossal magnetic anisotropy energy, of the order of the critical temperature. Second, a persistent electronic current circulates around the magnetic atom and, in the case of a ferromagnetic phase, around the edges of the surface.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0038-1098</s0></fA01><fA02 i1="01"><s0>SSCOA4</s0></fA02><fA03 i2="1"><s0>Solid state commun.</s0></fA03><fA05><s2>152</s2></fA05><fA06><s2>5</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Colossal anisotropy in diluted magnetic topological insulators</s1></fA08><fA11 i1="01" i2="1"><s1>NUNEZ (A. 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