學術產出-Periodical Articles

Article View/Open

Publication Export

Google ScholarTM

政大圖書館

Citation Infomation

題名 Transverse force generated by an electric field and transverse charge imbalance in spin-orbit coupled systems by an electric field and transverse charge imbalance in spin-orbit coupled systems
作者 郭光宇
Chen, Tsung-Wei ; Hsu, Hsiu-Chuan ; Guo, Guang-Yu
貢獻者 應物所
日期 2009.10
上傳時間 24-Jan-2014 12:21:43 (UTC+8)
摘要 We use linear-response theory to study the transverse force generated by an external electric field and hence possible charge Hall effect in spin-orbit coupled systems. In addition to the Lorentz force that is parallel to the electric field, we find that the transverse force perpendicular to the applied electric field may not vanish in a system with an anisotropic energy dispersion. Surprisingly, in contrast to the previous results, the transverse force generated by the electric field does not depend on the spin current, but in general, it is related to the second derivative of energy dispersion only. The transverse force always vanishes in the system with an isotropic energy dispersion. However, the transverse force may also vanish in some systems with an anisotropic energy dispersion such as the two-dimensional k-cubic Dresselhaus system. Furthermore, we find that the transverse force does not vanish in the Rashba-Dresselhaus system. Therefore, the nonvanishing transverse force acts as a driving force and results in charge imbalance at the edges of the sample. This implies that a nonzero Hall voltage can be detected in the absence of an external magnetic field in anisotropic systems such as the Rashba-Dresselhaus system. The estimated ratio of the Hall voltage to the longitudinal voltage is ∼10−3. The disorder effect is also considered in the study of the Rashba-Dresselhaus system. We find that the transverse force vanishes in the presence of impurities in this system because the vertex correction and the anomalous velocity of the electron accidently cancel each other. Nonetheless, we believe that the transverse charge imbalance can be detected in the ballistic region by measuring the Hall voltage. Our interesting prediction would stimulate measurements of the Hall voltage in such spin-orbit coupled systems with an anisotropic dispersion as the Rashba-Dresselhaus system in the near future.
關聯 Physical Review B, 80(16),165302
資料類型 article
DOI http://dx.doi.org/10.1103/PhysRevB.80.165302
dc.contributor 應物所en_US
dc.creator (作者) 郭光宇zh_TW
dc.creator (作者) Chen, Tsung-Wei ; Hsu, Hsiu-Chuan ; Guo, Guang-Yuen_US
dc.date (日期) 2009.10en_US
dc.date.accessioned 24-Jan-2014 12:21:43 (UTC+8)-
dc.date.available 24-Jan-2014 12:21:43 (UTC+8)-
dc.date.issued (上傳時間) 24-Jan-2014 12:21:43 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/63524-
dc.description.abstract (摘要) We use linear-response theory to study the transverse force generated by an external electric field and hence possible charge Hall effect in spin-orbit coupled systems. In addition to the Lorentz force that is parallel to the electric field, we find that the transverse force perpendicular to the applied electric field may not vanish in a system with an anisotropic energy dispersion. Surprisingly, in contrast to the previous results, the transverse force generated by the electric field does not depend on the spin current, but in general, it is related to the second derivative of energy dispersion only. The transverse force always vanishes in the system with an isotropic energy dispersion. However, the transverse force may also vanish in some systems with an anisotropic energy dispersion such as the two-dimensional k-cubic Dresselhaus system. Furthermore, we find that the transverse force does not vanish in the Rashba-Dresselhaus system. Therefore, the nonvanishing transverse force acts as a driving force and results in charge imbalance at the edges of the sample. This implies that a nonzero Hall voltage can be detected in the absence of an external magnetic field in anisotropic systems such as the Rashba-Dresselhaus system. The estimated ratio of the Hall voltage to the longitudinal voltage is ∼10−3. The disorder effect is also considered in the study of the Rashba-Dresselhaus system. We find that the transverse force vanishes in the presence of impurities in this system because the vertex correction and the anomalous velocity of the electron accidently cancel each other. Nonetheless, we believe that the transverse charge imbalance can be detected in the ballistic region by measuring the Hall voltage. Our interesting prediction would stimulate measurements of the Hall voltage in such spin-orbit coupled systems with an anisotropic dispersion as the Rashba-Dresselhaus system in the near future.en_US
dc.format.extent 439329 bytes-
dc.format.mimetype application/pdf-
dc.language.iso en_US-
dc.relation (關聯) Physical Review B, 80(16),165302en_US
dc.title (題名) Transverse force generated by an electric field and transverse charge imbalance in spin-orbit coupled systems by an electric field and transverse charge imbalance in spin-orbit coupled systemsen_US
dc.type (資料類型) articleen
dc.identifier.doi (DOI) 10.1103/PhysRevB.80.165302-
dc.doi.uri (DOI) http://dx.doi.org/10.1103/PhysRevB.80.165302-