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arXiv 0908.1038cond-mat.str-elcond-mat.stat-mech
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分数量子数粒子在condensed matter系统中的禁闭

Confinement of fractional quantum number particles in a condensed matter system

B. Lake, A. M. Tsvelik, S. Notbohm, D. A. Tennant, T. G. Perring, M. Reehuis, C. Sekar, G. Krabbes, B. Büchner

摘要:

约束的概念指出,在某些系统中,组成粒子只能间接地被相互作用所束缚,这种相互作用的强度随着粒子分离的增加而增加。虽然最著名的例子是在(3+1)维量子色动力学中夸克被限制形成重子和介子,但限制也可以在凝聚态物理系统中实现,例如由两个自旋为1/2的反铁磁链通过自旋交换相互作用耦合在一起的自旋梯。自旋S=1/2的单个链(自旋子)的激发甚至被无限小的链间耦合所限制。到目前为止研究的实现不能说明这一过程,由于其大强度的链间耦合,没有留下能量窗口的自旋激发的个别链。在这里,我们提出了弱耦合梯形材料的中子散射实验。在高能量的光谱函数接近的个别链,在低能量下,它是由自旋0,1强耦合链的激发为主。

英文摘要:

The idea of confinement states that in certain systems constituent particles can be discerned only indirectly being bound by an interaction whose strength increases with increasing particle separation. Though the most famous example is the confinement of quarks to form baryons and mesons in (3+1)-dimensional Quantum Chromodynamics, confinement can also be realized in the systems of condensed matter physics such as spin-ladders which consist of two spin-1/2 antiferromagnetic chains coupled together by spin exchange interactions. Excitations of individual chains (spinons) carrying spin S=1/2, are confined even by an infinitesimal interchain coupling. The realizations studied so far cannot illustrate this process due to the large strength of their interchain coupling which leaves no energy window for the spinon excitations of individual chains. Here we present neutron scattering experiments for a weakly-coupled ladder material. At high energies the spectral function approaches that of individual chains; at low energies it is dominated by spin 0,1 excitations of strongly-coupled chains.

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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