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arXiv quant-ph/0612122quant-phcond-mat.stat-mechhep-thmath-phmath.MPnucl-th
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具有能级“偶然”简并的q振子

A q-Oscillator with 'Accidental' Degeneracy of Energy Levels

A. M. Gavrilik, A. P. Rebesh

摘要:

我们研究了q变形振子奇异情形的主要特征(所谓的Tamm-Dancoff截止振荡器),并找到一些特殊的性质:(i)在变形参数的{ \em实值} q= \sqrt{\frac{n_1}{n_1+2}}时,能级E_{n_1} = E_{n_1+1},n_1 \ge 1的简并性,以及对于k \ge 2,其它简并性E_{n_1} = E_{n_1+k}的出现,(ii)位置和动量算符X和P { \em在态上可交换}| m>如果q被固定为q= \frac{m}{m+1},这意味着不寻常的不确定关系;(iii)这个q-振子的创建、湮灭和数算子的两个交换副本生成{ \em非单}李代数su(2)\oplus u(1)的相应q-变形,其非平凡q-变形交换关系为:其中J_0 \equiv \frac 12(N_1-N_2)和J_3 \equiv \frac 12(N_1+N_2)。

英文摘要:

We study main features of the exotic case of q-deformed oscillators (so-called Tamm-Dancoff cutoff oscillator) and find some special properties: (i) degeneracy of the energy levels E_{n_1} = E_{n_1+1}, n_1\ge 1, at the {\em real value} q=\sqrt{\frac{n_1}{n_1+2}} of deformation parameter, as well as the occurrence of other degeneracies E_{n_1} = E_{n_1+k}, for k \ge 2, at the corresponding values of q which depend on both n_1 and k; (ii) the position and momentum operators X and P {\em commute on the state} |m> if q is fixed as q=\frac{m}{m+1}, that implies unusual uncertainty relation; (iii) two commuting copies of the creation, annihilation, and number operators of this q-oscillator generate the corresponding q-deformation of the {\em non-simple} Lie algebra su(2)\oplus u(1) whose nontrivial q-deformed commutation relation is: [ J_+, J_- ] = 2 J_0 q^{2J_3-1} where J_0\equiv \frac12 (N_1-N_2) and J_3\equiv \frac12 (N_1+N_2).

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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