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arXiv 0911.2200cond-mat.mes-hall
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量子点在Wigner分子体系中的输运性质

Transport properties of quantum dots in the Wigner molecule regime

F. Cavaliere, U. De Giovannini, M. Sassetti, B. Kramer

摘要:

利用投影Hartree-Fock方法研究了N=7电子的量子点从弱相互作用到强相互作用的输运性质。随着相互作用的增加,点中的径向有序发展,形成环和中心环结构。随后,角相关出现,标志着维格纳分子态的形成。我们展示了在运输过程中发现的维格纳分子出现的惊人特征。在线性状态下,随着相互作用强度的增加,电导呈指数抑制。进一步的抑制时,观察到中心环结构的发展,或奇特的自旋纹理出现。在非线性区域,分子态的形成甚至可能导致电导增强。

英文摘要:

The transport properties of quantum dots with up to N=7 electrons ranging from the weak to the strong interacting regime are investigated via the projected Hartree-Fock technique. As interactions increase radial order develops in the dot, with the formation of ring and centered-ring structures. Subsequently, angular correlations appear, signalling the formation of a Wigner molecule state. We show striking signatures of the emergence of Wigner molecules, detected in transport. In the linear regime, conductance is exponentially suppressed as the interaction strength grows. A further suppression is observed when centered-ring structures develop, or peculiar spin textures appear. In the nonlinear regime, the formation of molecular states may even lead to a conductance enhancement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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