量子相变

量子相变是一种发生在绝对零度，由量子涨落而非热涨落导致的相变现象，满足著名的海森堡不确定关系。

Quantum phase transitions occur only at the absolute zero of temperature , driven by quantum fluctuation not thermal fluctuation and dictated by Heisenberg 's famous uncertainty principle .

最后我们采用李&杨零点方法对一维横场各向异性XY模型在零温下的量子相变作了较为系统的研究。

Finally , we apply the theory to study the quantum phase transitions of one-dimensional anisotropic XY quantum spin chain in a transverse field at zero temperature .

超晶格输运与光格子中BEC的量子相变

Transport in Semiconductor Superlattice and Phase Transition of BEC in Optical Lattice

双层Heisenberg反铁磁体中的量子相变

Quantum phase transition in a bilayer Heisenberg antiferromagnet

进一步，我们将腔内含单个原子情形推广到含N个原子的情形，并利用平均场近似研究了这个光纡耦合腔阵系统的量子相变问题，得到了腔内不同原子数情形的相图。

Moreover , we generalize the one-atom case to the N-atom case and use the mean field approximation to explore the quantum phase transition in this many body system . The phase di-agrams are obtained for cases with different numbers of atoms in single cavity .

德国Munich研究小组首次在三维光晶格中观察到了超冷原子从BEC超流状态向Mottinsulator状态的量子相变。

A research group in Munich has demonstrated for the first time the quantum phase transition of a superfluid state to the Mott insulator state of a BEC confined in a 3D optical lattice .

本文将李&杨平衡相变理论推广于研究沙粒分离的urn模型非平衡相变和一维横场各向异性XY模型量子相变。

The Yang-Lee theory of equilibrium phase transitions is generalized to study the non-equilibrium phase transitions of an urn model for the separation of sand and the quantum phase transitions of one-dimensional anisotropic XY quantum spin chain in a transverse field .

转动诱发原子核量子相变的一种可能途径

A possible route of nuclear quantum phase transition induced by rotation

光晶格中两分量冷原子量子相变的研究

Phase Transition of Two-Component Ultra-Cold Atoms in Optical Lattices

微腔中多体系统的新奇量子相变及其调控

Exotic Quantum Phase Transitions and Their Controllability of Many-body Systems in the Micro-cavities

量子相变中存在经典系统中没有的量子关联&纠缠。

Entanglement is the quantum correlation , which does not exist in classical system .

在现代凝聚态物理中，量子相变是一个研究的热点。

In the modern condense physics , quantum phase transition is a study hotspot .

纠缠与量子相变关系及量子控制的理论研究

Theoretical Study on the Relationship between Quantum Entanglement and Quantum Phase Transition and Quantum Control

该量子相变的动力学后果是开放量子系统中的二能级系统的退相干抑制。

The dynamical consequence of such a quantum phase transition is the decoherence suppression of the two-level system .

一般说来，量子相变的发生伴随着处于临界点时量子系统基态的能级交叉或者是某种对称性的破缺。

Generally , it is associated with the ground state with energy level crossing and symmetry breaking at the critical points .

特别，我们也发现光子-光子对混合气体的量子相变本质上可以看作是一种增强的二次谐波产生。

Especially , we find that the phase transition of the photons gas can be interpreted as enhanced second harmonic generation .

自旋链在平面波背景下的孤子解和光格子中超冷原子的量子相变

Exact Soliton Solution of the Spin Chain in a Plane Wave Background and Quantum Phase Transition of the Dipolar Bosons in Optical Lattices

最近，人们发现对于一个量子相变系统，在它的临界点附近，量子相变系统的动力学具有极高的敏感性。

Recently , it was discovered that , near the quantum critical point the QPT system possesses the ultra-sensitivity in its dynamical evolution .

通过对激发谱的分析，我们还进一步描述了光子-光子对的超流行为与系统量子相变的关系。

Moreover , by investigating the excitation spectrum , we also illustrate the relation between superfluid and phase transition of photons and photons pairs .

运用变分方法，我们也调查了混合气体在基态的量子相变情况，并获得了系统的临界相变线。

Using variational method , we also discuss the ground-state phase transition of the two-component system , and obtain the critical coupling line analytically .

非线性对隧穿项导致了系统能谱的重要修正，引起了被看作量子相变的基态突变。

A crucial atom-pair tunnelling term results in significant energy spectrum corrections and an abrupt change of the ground state viewed as quantum phase transition .

文章还计算了参数取不同值情况下的基态纠缠并给出了发生量子相变的临界点的表达式。

And also calculates the ground-state entanglement under various control parameters and gives expressions for the quantum critical points at which quantum phase transition takes place .

作为其中的代表，玻色&哈伯德模型已经成为研究量子相变等凝聚态物理内容的重要模型。

As one typical model , the Bose-Hubbard model has been an important model to investigate the quantum phase transition and other contents of condensed matter physics .

通过计算系统的基态能量、基态纠缠等量我们证实该量子相变是一级相变。

We calculate the quantities , such as the ground state energy , entanglement entropy and so on , and confirm that it is a first-order quantum phase transition .

另外，在零温下，量子相变出现了，而且随着各向异性参数的增加，发生量子相变的点向磁场移动。

Besides , quantum phase transition occurs at zero temperature , and the phase transition point is shifted to low magnetic field if temperature keeps low as the anisotropic parameter is increased .

加载在光学晶格中的超冷玻色子可以发生超流-Mott绝缘体相变，这是目前人们最感兴趣的量子相变之一。

It is of great interest that the quantum phase transition between the superfluid and Mott phases can be observed when cold bosonic atoms with a repulsive two-body interaction are loaded into an optical lattice .

发现相比与均匀磁场下，在非均匀磁场下可以在更高的温度下得到纠缠，而且在零温下出现了两次量子相变，纠缠呈现台阶式的变化。

We can obtain entanglement at higher temperature with an inhomogeneous magnetic field contrast to uniform magnetic field . Moreover , we find that quantum occurs twice at zero temperature and that entanglement appears step-form change .

固态自旋系统中的量子纠缠和量子相变

Quantum Entanglement and Quantum Phase Transition in Solid-state Spin Systems

人们发现量子纠缠可能是量子相变的一个标示物理量。

Many studies have shown that entanglement can be used to identify quantum phase transitions .

基于iMPS算法研究一维无限量子三态Potts模型的量子相变

Quantum Phase Transition of 1D Infinite Three-state Potts Model Based on iMPS Algorithm