{"title":"基于Rashba自旋-轨道耦合的石墨烯-纳米带器件中的量子输运","authors":"Xiao-Dong Tan, Jian Lei, Yu Shi, Li-Jun Li","doi":"10.1007/s10773-026-06326-0","DOIUrl":null,"url":null,"abstract":"<div><p>Based on the mean-field Hubbard model and the Green’s function formalism, we study the transport properties in a graphene-nanoribbon-based device with Rashba spin–orbit coupling (RSOC). Several influences on the conductance are discussed in detail, including ribbon width, ribbon length, RSOC, top-gate-generated potential energy <i>V</i>, on-site Coulomb repulsion <i>U</i>, Fermi energy <i>E</i><sub><i>F</i></sub>, and temperature <i>T</i>. The results show that the transport properties of this device are strongly related to its magnetic configurations that are primarily determined by <i>U</i>, and partly dependent on <i>V</i> and <i>E</i><sub><i>F</i></sub>. The RSOC and <i>T</i> have no significant effect on the total conductance. Interestingly, the total conductance exhibits a fluctuating behavior with increasing ribbon length and <i>V</i> at <i>U</i> = 1.2<i>t</i>. This behavior of conductance could be well modulated by top and back gates, thus making it available for field-effect transistors.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"65 4","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Quantum Transport in a Graphene-Nanoribbon-Based Device with Rashba Spin- Orbit Coupling\",\"authors\":\"Xiao-Dong Tan, Jian Lei, Yu Shi, Li-Jun Li\",\"doi\":\"10.1007/s10773-026-06326-0\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Based on the mean-field Hubbard model and the Green’s function formalism, we study the transport properties in a graphene-nanoribbon-based device with Rashba spin–orbit coupling (RSOC). Several influences on the conductance are discussed in detail, including ribbon width, ribbon length, RSOC, top-gate-generated potential energy <i>V</i>, on-site Coulomb repulsion <i>U</i>, Fermi energy <i>E</i><sub><i>F</i></sub>, and temperature <i>T</i>. The results show that the transport properties of this device are strongly related to its magnetic configurations that are primarily determined by <i>U</i>, and partly dependent on <i>V</i> and <i>E</i><sub><i>F</i></sub>. The RSOC and <i>T</i> have no significant effect on the total conductance. Interestingly, the total conductance exhibits a fluctuating behavior with increasing ribbon length and <i>V</i> at <i>U</i> = 1.2<i>t</i>. This behavior of conductance could be well modulated by top and back gates, thus making it available for field-effect transistors.</p></div>\",\"PeriodicalId\":597,\"journal\":{\"name\":\"International Journal of Theoretical Physics\",\"volume\":\"65 4\",\"pages\":\"\"},\"PeriodicalIF\":1.7000,\"publicationDate\":\"2026-04-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Theoretical Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10773-026-06326-0\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Theoretical Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10773-026-06326-0","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
Quantum Transport in a Graphene-Nanoribbon-Based Device with Rashba Spin- Orbit Coupling
Based on the mean-field Hubbard model and the Green’s function formalism, we study the transport properties in a graphene-nanoribbon-based device with Rashba spin–orbit coupling (RSOC). Several influences on the conductance are discussed in detail, including ribbon width, ribbon length, RSOC, top-gate-generated potential energy V, on-site Coulomb repulsion U, Fermi energy EF, and temperature T. The results show that the transport properties of this device are strongly related to its magnetic configurations that are primarily determined by U, and partly dependent on V and EF. The RSOC and T have no significant effect on the total conductance. Interestingly, the total conductance exhibits a fluctuating behavior with increasing ribbon length and V at U = 1.2t. This behavior of conductance could be well modulated by top and back gates, thus making it available for field-effect transistors.
期刊介绍：
International Journal of Theoretical Physics publishes original research and reviews in theoretical physics and neighboring fields. Dedicated to the unification of the latest physics research, this journal seeks to map the direction of future research by original work in traditional physics like general relativity, quantum theory with relativistic quantum field theory,as used in particle physics, and by fresh inquiry into quantum measurement theory, and other similarly fundamental areas, e.g. quantum geometry and quantum logic, etc.
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