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arXiv 0809.1765cond-mat.mes-hallcond-mat.str-el
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Wigner分子的畸变:对函数方法

Distortion of Wigner molecules : pair function approach

M. Taut

摘要:

在Wigner极限下,考虑了磁场中的二维三电子量子点。幺正坐标变换将哈密顿量(包括电子之间的库仑相互作用)分解为三个独立的对哈密顿量之和。对哈密顿量的本征解提供了对态的谱。每一对状态定义了该状态中所涉及的两个电子的距离。在基态,对于给定的对角动量$m$,这个距离随着$|m|$的增加而增加。根据泡利不相容原理,对电子态必须被占据,泡利不相容原理与单电子态不同,取决于总自旋$S$和总轨道角动量$M_L=\sum m_i$(所有对电子角动量之和)。我们已经证明,只有当基态是四重态($S=3/2$)且轨道角动量是魔量子数($M_L=3 m ; m=$整数)时,维格纳分子基态中的三个电子才能形成等边三角形(正如预期的那样)。否则基态的三角形是等腰的。对于$M_L=3 m+1$,其中一条边较长,而对于$M_L=3 m-1$,其中一条边比其他两条边短。

英文摘要:

We considered a two dimensional three electron quantum dot in a magnetic field in the Wigner limit. A unitary coordinate transformation decouples the Hamiltonian (with Coulomb interaction between the electrons included) into a sum of three independent pair Hamiltonians. The eigen-solutions of the pair Hamiltonian provide a spectrum of pair states. Each pair state defines the distance of the two electrons involved in this state. In the ground state for given pair angular momentum $m$, this distance increases with increasing $|m|$. The pair states have to be occupied under consideration of the Pauli exclusion principle, which differs from that for one-electron states and depends on the total spin $S$ and the total orbital angular momentum $M_L=\sum m_i$ (sum over all pair angular momenta). We have shown that the three electrons in the ground state of the Wigner molecule form an equilateral triangle (as might be expected) only, if the state is a quartet ($S=3/2$) and the orbital angular momentum is a magic quantum number ($M_L=3 m ; m=$ integer). Otherwise the triangle in the ground state is isosceles. For $M_L=3 m+1$ one of the sides is longer and for $M_L=3 m-1$ one of the sides is shorter than the other two.

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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