arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.0693cond-mat.stat-mech
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Ising自旋链中粒子的分类

Taxonomy of particles in Ising spin chains

Dan Liu, Ping Lu, Gerhard Muller, Michael Karbach

摘要:

在具有均匀最近邻耦合、二次单点势和磁场的$s=1$伊辛链的背景下研究了一维晶格上具有形状的粒子的统计力学,该链支持四种不同的基态:$|\uparrow\downarrow\uparrow\downarrow...>$,$|\circ\circ...>$,$|\uparrow\uparrow...>$,$|\uparrow\circ\uparrow\circ...>$ .完整的光谱是由来自不同的六种或七种物质的粒子从每个基态产生的。伪真空的粒子和元素的特征是模体(几个连续的位置变量的模式)。粒子是可以放置到晶格上的开放槽中的浮动对象。开放槽被认为是基序之间允许的链接。粒子的能量因物种而异,但与它所处的位置无关。一个粒子的放置改变了所有种类粒子的开口槽构型。这种统计相互作用被编码在广义泡利原理中,从该原理中确定给定粒子组合的状态的多重性,并用于精确的统计力学分析。来自所有物种的粒子都属于四种类型之一:致密体、宿主、标签或杂交体。实体和主机在伪真空段中找到开口槽。标记查找主机内部的打开插槽。Hybrids是具有托管功能的标签。在这里提出的粒子分类法中,“种”表示结构,“类”表示功能。托管函数将泡利原理分为排斥和调节部分。在相界附近,伊辛链在低温下的状态类似于具有作为表面活性剂分子的一种物质的颗粒的可混溶或不混溶液体的状态。

英文摘要:

The statistical mechanics of particles with shapes on a one-dimensional lattice is investigated in the context of the $s=1$ Ising chain with uniform nearest-neighbor coupling, quadratic single-site potential, and magnetic field, which supports four distinct ground states: $|\uparrow\downarrow\uparrow\downarrow...>$, $|\circ\circ...>$, $|\uparrow\uparrow...>$, $|\uparrow\circ\uparrow\circ...>$. The complete spectrum is generated from each ground state by particles from a different set of six or seven species. Particles and elements of pseudo-vacuum are characterized by motifs (patterns of several consecutive site variables). Particles are floating objects that can be placed into open slots on the lattice. Open slots are recognized as permissible links between motifs. The energy of a particle varies between species but is independent of where it is placed. Placement of one particle changes the open-slot configuration for particles of all species. This statistical interaction is encoded in a generalized Pauli principle, from which the multiplicity of states for a given particle combination is determined and used for the exact statistical mechanical analysis. Particles from all species belong to one of four categories: compacts, hosts, tags, or hybrids. Compacts and hosts find open slots in segments of pseudo-vacuum. Tags find open slots inside hosts. Hybrids are tags with hosting capability. In the taxonomy of particles proposed here, `species' is indicative of structure and `category' indicative of function. The hosting function splits the Pauli principle into exclusion and accommodation parts. Near phase boundaries, the state of the Ising chain at low temperature is akin to that of miscible or immiscible liquids with particles from one species acting as surfactant molecules.

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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