Spin frustration of a spin-1/2 Ising–Heisenberg three-leg tube as an indispensable ground for thermal entanglement
Spin frustration of a spin-1/2 Ising–Heisenberg three-leg tube as an indispensable ground for thermal entanglement
复制标题
自旋 1/2 伊辛-海森堡三腿管的自旋挫败是热纠缠不可或缺的基础
DOI：
10.1016/j.jmmm.2016.02.095
复制
发表时间：
2015
影响因子：
2.7
通讯作者：
Onofre Rojas
中科院分区：
文献类型：
--
作者：
J. Strečka;Raphael Cavalcante Alécio;M. Lyra;Onofre Rojas
在零磁场下精确求解了由海森伯自旋三角形通过伊辛三角形间相互作用相互耦合而成的自旋为1/2的伊辛-海森伯三足管。利用海森堡自旋三角形上总自旋的局域守恒，将模型严格映射到一个经典的复合自旋链模型上，然后用转移矩阵方法精确处理.详细讨论了基态相图、关联函数、并发度、Bell函数、熵和比热。结果表明，自旋挫折是一个不可或缺的理由，热纠缠，这是量化的量子并发。比热显示不同的温度依赖性，这可能包括一个尖锐的低温峰模仿温度驱动的一级相变。令人信服地证明，这一反常峰起源于大量的热激发从双简并基态到激发态与高宏观简并度由于手征自由度的海森堡自旋三角形。
The spin-1/2 Ising–Heisenberg three-leg tube composed of the Heisenberg spin triangles mutually coupled through the Ising inter-triangle interaction is exactly solved in a zero magnetic field. By making use of the local conservation for the total spin on each Heisenberg spin triangle the model can be rigorously mapped onto a classical composite spin-chain model, which is subsequently exactly treated through the transfer-matrix method. The ground-state phase diagram, correlation functions, concurrence, Bell function, entropy and specific heat are examined in detail. It is shown that the spin frustration represents an indispensable ground for a thermal entanglement, which is quantified by the quantum concurrence. The specific heat displays diverse temperature dependences, which may include a sharp low-temperature peak mimicking a temperature-driven first-order phase transition. It is convincingly evidenced that this anomalous peak originates from massive thermal excitations from the doubly degenerate ground state towards an excited state with a high macroscopic degeneracy due to chiral degrees of freedom of the Heisenberg spin triangles.
自旋纳米管的能隙
DOI：
--
发表时间：
2005
期刊：
Physica E 23・3-4
影响因子：
--
作者：
T.Sakai;M.Matsumoto;K.Okunishi;K.Okamoto;他
通讯作者：
他
DOI：
--
发表时间：
2010
期刊：
影响因子：
--
作者：
T.Sakai;M.Sato;K.Okunishi;K.Okamoto;C.Itoi
通讯作者：
C.Itoi