The Edge Magnetization and Strip Phase of Graphene Quantum Dots with Long-Range Coulomb Interaction
We investigate the magnetism and optical absorption properties of charge neutral hexagonal graphene quantum dots （GODs） terminated with zigzag edges by using a tight-binding Hubbard type model for the 7r electrons. Within the Hartree Fock approximation and taking into account the long-range Coulomb...
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| Veröffentlicht in: | Chinese physics letters 2014-04, Vol.31 (4), p.150-154 |
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| creator | Li, Ning Zhu, Wen-Huan Liang, Qi Ding, Guo-Hui |
| description | We investigate the magnetism and optical absorption properties of charge neutral hexagonal graphene quantum dots （GODs） terminated with zigzag edges by using a tight-binding Hubbard type model for the 7r electrons. Within the Hartree Fock approximation and taking into account the long-range Coulomb interaction, our cal- culation yields a ferromagnetic ground state with magnetic moments localized on the edges for GODs, and also gives an antiferromagnetism state with the energy very c/ose to the ferromagnetism ground state. We find that both the ferromagnetic and the antiferrornagnetic states have stripe patterned charge density distributions as a result of the long-range Coulomb interaction. The optical conductivity for GQDs has an energy gap in the low frequency regime in contrast to the bulk neutral graphene sheet where a universal constant is approached. |
| doi_str_mv | 10.1088/0256-307X/31/4/047303 |
| format | Article |
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Within the Hartree Fock approximation and taking into account the long-range Coulomb interaction, our cal- culation yields a ferromagnetic ground state with magnetic moments localized on the edges for GODs, and also gives an antiferromagnetism state with the energy very c/ose to the ferromagnetism ground state. We find that both the ferromagnetic and the antiferrornagnetic states have stripe patterned charge density distributions as a result of the long-range Coulomb interaction. The optical conductivity for GQDs has an energy gap in the low frequency regime in contrast to the bulk neutral graphene sheet where a universal constant is approached.</description><identifier>ISSN: 0256-307X</identifier><identifier>EISSN: 1741-3540</identifier><identifier>DOI: 10.1088/0256-307X/31/4/047303</identifier><language>eng</language><subject>Antiferromagnetism ; Constants ; Coulomb friction ; Ferromagnetism ; Graphene ; Ground state ; Magnetization ; Quantum dots ; 光吸收特性 ; 反铁磁性 ; 带材 ; 库仑相互作用 ; 电荷密度分布 ; 石墨 ; 磁化 ; 量子点</subject><ispartof>Chinese physics letters, 2014-04, Vol.31 (4), p.150-154</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c260t-2d4a64b557ecab212257cb32bd06923d235e6d00f0da57f86948a55952dad7c23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttp://image.cqvip.com/vip1000/qk/84212X/84212X.jpg</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids></links><search><creatorcontrib>Li, Ning</creatorcontrib><creatorcontrib>Zhu, Wen-Huan</creatorcontrib><creatorcontrib>Liang, Qi</creatorcontrib><creatorcontrib>Ding, Guo-Hui</creatorcontrib><title>The Edge Magnetization and Strip Phase of Graphene Quantum Dots with Long-Range Coulomb Interaction</title><title>Chinese physics letters</title><addtitle>Chinese Physics Letters</addtitle><description>We investigate the magnetism and optical absorption properties of charge neutral hexagonal graphene quantum dots （GODs） terminated with zigzag edges by using a tight-binding Hubbard type model for the 7r electrons. Within the Hartree Fock approximation and taking into account the long-range Coulomb interaction, our cal- culation yields a ferromagnetic ground state with magnetic moments localized on the edges for GODs, and also gives an antiferromagnetism state with the energy very c/ose to the ferromagnetism ground state. We find that both the ferromagnetic and the antiferrornagnetic states have stripe patterned charge density distributions as a result of the long-range Coulomb interaction. The optical conductivity for GQDs has an energy gap in the low frequency regime in contrast to the bulk neutral graphene sheet where a universal constant is approached.</description><subject>Antiferromagnetism</subject><subject>Constants</subject><subject>Coulomb friction</subject><subject>Ferromagnetism</subject><subject>Graphene</subject><subject>Ground state</subject><subject>Magnetization</subject><subject>Quantum dots</subject><subject>光吸收特性</subject><subject>反铁磁性</subject><subject>带材</subject><subject>库仑相互作用</subject><subject>电荷密度分布</subject><subject>石墨</subject><subject>磁化</subject><subject>量子点</subject><issn>0256-307X</issn><issn>1741-3540</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNo9kEtLw0AURgdRsFZ_gjDu3MTceSZdSq21UPFVwd0wyUyaSDvTZiaI_npTWrq6m-8cuAehawJ3BPI8BSpkwiD7ShlJeQo8Y8BO0IBknCRMcDhFg-PmHF2E8A1ASE7IAJWL2uKJWVr8rJfOxuZPx8Y7rJ3BH7FtNvi11sFiX-Fpqze1dRa_ddrFbo0ffAz4p4k1nnu3TN616zVj3638usAzF22ry53sEp1VehXs1eEO0efjZDF-SuYv09n4fp6UVEJMqOFa8kKIzJa6oIRSkZUFo4UBOaLMUCasNAAVGC2yKpcjnmshRoIabbKSsiG63Xs3rd92NkS1bkJpVyvtrO-CIlICcCKF7KdiPy1bH0JrK7Vpm7VufxUBtYuqdsHULphiRHG1j9pzNweu7l_eNm55BPmIiZ7M2D9y9XVJ</recordid><startdate>20140401</startdate><enddate>20140401</enddate><creator>Li, Ning</creator><creator>Zhu, Wen-Huan</creator><creator>Liang, Qi</creator><creator>Ding, Guo-Hui</creator><scope>2RA</scope><scope>92L</scope><scope>CQIGP</scope><scope>~WA</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20140401</creationdate><title>The Edge Magnetization and Strip Phase of Graphene Quantum Dots with Long-Range Coulomb Interaction</title><author>Li, Ning ; Zhu, Wen-Huan ; Liang, Qi ; Ding, Guo-Hui</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c260t-2d4a64b557ecab212257cb32bd06923d235e6d00f0da57f86948a55952dad7c23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Antiferromagnetism</topic><topic>Constants</topic><topic>Coulomb friction</topic><topic>Ferromagnetism</topic><topic>Graphene</topic><topic>Ground state</topic><topic>Magnetization</topic><topic>Quantum dots</topic><topic>光吸收特性</topic><topic>反铁磁性</topic><topic>带材</topic><topic>库仑相互作用</topic><topic>电荷密度分布</topic><topic>石墨</topic><topic>磁化</topic><topic>量子点</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Li, Ning</creatorcontrib><creatorcontrib>Zhu, Wen-Huan</creatorcontrib><creatorcontrib>Liang, Qi</creatorcontrib><creatorcontrib>Ding, Guo-Hui</creatorcontrib><collection>中文科技期刊数据库</collection><collection>中文科技期刊数据库-CALIS站点</collection><collection>中文科技期刊数据库-7.0平台</collection><collection>中文科技期刊数据库- 镜像站点</collection><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>Chinese physics letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Li, Ning</au><au>Zhu, Wen-Huan</au><au>Liang, Qi</au><au>Ding, Guo-Hui</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Edge Magnetization and Strip Phase of Graphene Quantum Dots with Long-Range Coulomb Interaction</atitle><jtitle>Chinese physics letters</jtitle><addtitle>Chinese Physics Letters</addtitle><date>2014-04-01</date><risdate>2014</risdate><volume>31</volume><issue>4</issue><spage>150</spage><epage>154</epage><pages>150-154</pages><issn>0256-307X</issn><eissn>1741-3540</eissn><abstract>We investigate the magnetism and optical absorption properties of charge neutral hexagonal graphene quantum dots （GODs） terminated with zigzag edges by using a tight-binding Hubbard type model for the 7r electrons. 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| ispartof | Chinese physics letters, 2014-04, Vol.31 (4), p.150-154 |
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| language | eng |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Antiferromagnetism Constants Coulomb friction Ferromagnetism Graphene Ground state Magnetization Quantum dots 光吸收特性 反铁磁性 带材 库仑相互作用 电荷密度分布 石墨 磁化 量子点 |
| title | The Edge Magnetization and Strip Phase of Graphene Quantum Dots with Long-Range Coulomb Interaction |
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