Orbital magnetic moments in insulating Dirac systems: Impact on magnetotransport in graphene van der Waals heterostructures
In honeycomb Dirac systems with broken inversion symmetry, orbital magnetic moments coupled to the valley degree of freedom arise due to the topology of the band structure, leading to valley-selective optical dichroism. On the other hand, in Dirac systems with prominent spin-orbit coupling, similar...
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Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-11, Vol.90 (20), Article 205408 |
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description | In honeycomb Dirac systems with broken inversion symmetry, orbital magnetic moments coupled to the valley degree of freedom arise due to the topology of the band structure, leading to valley-selective optical dichroism. On the other hand, in Dirac systems with prominent spin-orbit coupling, similar orbital magnetic moments emerge as well. These moments are coupled to spin, but otherwise have the same functional form as the moments stemming from spatial inversion breaking. After reviewing the basic properties of these moments, which are relevant for a whole set of newly discovered materials, such as silicene and germanene, we study the particular impact that these moments have on graphene nanoengineered barriers with artificially enhanced spin-orbit coupling. We examine transmission properties of such barriers in the presence of a magnetic field. The orbital moments are found to manifest in transport characteristics through spin-dependent transmission and conductance, making them directly accessible in experiments. Moreover, the Zeeman-type effects appear without explicitly incorporating the Zeeman term in the models, i.e., by using minimal coupling and Peierls substitution in continuum and the tight-binding methods, respectively. We find that a quasiclassical view is able to explain all the observed phenomena. |
doi_str_mv | 10.1103/PhysRevB.90.205408 |
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On the other hand, in Dirac systems with prominent spin-orbit coupling, similar orbital magnetic moments emerge as well. These moments are coupled to spin, but otherwise have the same functional form as the moments stemming from spatial inversion breaking. After reviewing the basic properties of these moments, which are relevant for a whole set of newly discovered materials, such as silicene and germanene, we study the particular impact that these moments have on graphene nanoengineered barriers with artificially enhanced spin-orbit coupling. We examine transmission properties of such barriers in the presence of a magnetic field. The orbital moments are found to manifest in transport characteristics through spin-dependent transmission and conductance, making them directly accessible in experiments. Moreover, the Zeeman-type effects appear without explicitly incorporating the Zeeman term in the models, i.e., by using minimal coupling and Peierls substitution in continuum and the tight-binding methods, respectively. We find that a quasiclassical view is able to explain all the observed phenomena.</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><identifier>DOI: 10.1103/PhysRevB.90.205408</identifier><language>eng</language><subject>Barriers ; Condensed matter ; Graphene ; Inversions ; Joining ; Magnetic moment ; Nanostructure ; Orbitals ; Spin-orbit interactions</subject><ispartof>Physical review. 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The orbital moments are found to manifest in transport characteristics through spin-dependent transmission and conductance, making them directly accessible in experiments. Moreover, the Zeeman-type effects appear without explicitly incorporating the Zeeman term in the models, i.e., by using minimal coupling and Peierls substitution in continuum and the tight-binding methods, respectively. We find that a quasiclassical view is able to explain all the observed phenomena.</description><subject>Barriers</subject><subject>Condensed matter</subject><subject>Graphene</subject><subject>Inversions</subject><subject>Joining</subject><subject>Magnetic moment</subject><subject>Nanostructure</subject><subject>Orbitals</subject><subject>Spin-orbit interactions</subject><issn>1098-0121</issn><issn>1550-235X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNo1kF9LwzAUxYMoOKdfwKc8-tKZpEnT-uZ_B4OJKPoW0vR2q7RpTdLB8MubsQkX7r2Hcy6XH0KXlMwoJen163rr32BzNyvIjBHBSX6EJlQIkrBUfB3HmRR5Qiijp-jM-29CKC84m6DfpSuboFvc6ZWF0Bjc9R3Y4HFjY_mx1aGxK_zQOG2w3_oAnb_B827QJuDeHnJ9cNr6oXdhl1s5PazBAt5oiytw-FPr1uM1BHC9D240YXTgz9FJHXW4OPQp-nh6fL9_SRbL5_n97SIxLCchyWQqpayp5pyXmkqo48oykWUVN6Qui6w0VSWFEJSANpWEzJRV1POKM6jydIqu9ncH1_-M4IPqGm-gbbWFfvSKShLpZCmT0cr2VhMf9Q5qNbim026rKFE70uqftCqI2pNO_wASbXcn</recordid><startdate>20141110</startdate><enddate>20141110</enddate><creator>Grujić, Marko M.</creator><creator>Tadić, Milan Ž.</creator><creator>Peeters, François M.</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20141110</creationdate><title>Orbital magnetic moments in insulating Dirac systems: Impact on magnetotransport in graphene van der Waals heterostructures</title><author>Grujić, Marko M. ; Tadić, Milan Ž. ; Peeters, François M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c280t-673777f1a444ba17ef77726566d4c0fb96bcdd755510eacd7e6cbdfb98d42ed83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Barriers</topic><topic>Condensed matter</topic><topic>Graphene</topic><topic>Inversions</topic><topic>Joining</topic><topic>Magnetic moment</topic><topic>Nanostructure</topic><topic>Orbitals</topic><topic>Spin-orbit interactions</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Grujić, Marko M.</creatorcontrib><creatorcontrib>Tadić, Milan Ž.</creatorcontrib><creatorcontrib>Peeters, François M.</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physical review. B, Condensed matter and materials physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Grujić, Marko M.</au><au>Tadić, Milan Ž.</au><au>Peeters, François M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Orbital magnetic moments in insulating Dirac systems: Impact on magnetotransport in graphene van der Waals heterostructures</atitle><jtitle>Physical review. B, Condensed matter and materials physics</jtitle><date>2014-11-10</date><risdate>2014</risdate><volume>90</volume><issue>20</issue><artnum>205408</artnum><issn>1098-0121</issn><eissn>1550-235X</eissn><abstract>In honeycomb Dirac systems with broken inversion symmetry, orbital magnetic moments coupled to the valley degree of freedom arise due to the topology of the band structure, leading to valley-selective optical dichroism. On the other hand, in Dirac systems with prominent spin-orbit coupling, similar orbital magnetic moments emerge as well. These moments are coupled to spin, but otherwise have the same functional form as the moments stemming from spatial inversion breaking. After reviewing the basic properties of these moments, which are relevant for a whole set of newly discovered materials, such as silicene and germanene, we study the particular impact that these moments have on graphene nanoengineered barriers with artificially enhanced spin-orbit coupling. We examine transmission properties of such barriers in the presence of a magnetic field. The orbital moments are found to manifest in transport characteristics through spin-dependent transmission and conductance, making them directly accessible in experiments. Moreover, the Zeeman-type effects appear without explicitly incorporating the Zeeman term in the models, i.e., by using minimal coupling and Peierls substitution in continuum and the tight-binding methods, respectively. We find that a quasiclassical view is able to explain all the observed phenomena.</abstract><doi>10.1103/PhysRevB.90.205408</doi><oa>free_for_read</oa></addata></record> |
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subjects | Barriers Condensed matter Graphene Inversions Joining Magnetic moment Nanostructure Orbitals Spin-orbit interactions |
title | Orbital magnetic moments in insulating Dirac systems: Impact on magnetotransport in graphene van der Waals heterostructures |
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