A family of spin-switching, inhomogeneous Hubbard chains

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• 作者：Y. Hancock
• 关键词：Hubbard model ; Itinerant magnetism ; Low dimensional systems ; Spin properties ; Quantum dots
• 刊名：Physica E
• 出版年：February, 2014
• 年：2014
• 卷：56
• 期：Complete
• 页码：141-150
• 全文大小：874 K

文摘

A family of spin-switching, inhomogeneous, Hubbard-type systems is proposed consisting of finite chains of nonmagnetic N-atoms separated by a magnetic M-atom spacer. Due to the extended N-atom region, multiple spin-switching events can be activated upon application of an external magnetic field and as a function of the electron filling. Varying the external magnetic field strength enables spin-switching to be triggered by the addition of a single electron. Extended Coulomb interactions are used to produce a greater range of spin-switching signals. The potential to tune the spin-switching as a function of the N/M atom ratio and model parameterization is also demonstrated.