文档介绍：量子色动力学的凝聚态物理
王 群
中国科技大学/近代物理系
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量子色动力学
核力(强作用力)是自然界四种根本力之一 夸克和胶子构成核子，强作用力的根本粒子
量子色动力学: 强作用的根本984)
Schafer (2000)
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Pair breaking?
不对称配对
rare case
real case
in cold dense quark matter
摘自黄梅的报告
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ur
ug
ub
dg
dr
db
化学平衡和电中性色中性条件
摘自黄梅的报告
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弱耦合近似下的能隙
Son (1999); Pisarski, Rischke (2000); Brown, Liu, Ren (2000);
Rischke, Wang (2002)
Depending on phases
Characteristic
of CSC
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能隙(结果)
Two-gap structure breaks BCS-ratio
Exponential suppression factor in CSL from angular integral
(Zero temperature) (transition temperature)
Schmitt, Wang, Rischke, PRD(2003)
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Mixing of gluon and photon in CSC
New electric charge and
8th color charge
New photon and gluon
New coupling constant
光子与胶子的迈斯纳质量
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与弱电模型比较
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计算方法
Nambu-Gorkov basis: Calculate polarization tensor
diagonalization
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Rotated photon can penetrate into 2SC and CFL: no EM Meissner effect
Rotated photon in CSL phases has a non-vanishing mass: EM Meissner effect
Since , in weak couplings, spin-1 color-superconductor (CSL or polar phase) a type-I superconductor
迈斯纳质量：结果总结
Schmitt, QW, Rischke, PRL(2003)
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色超导与电超导的比较
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强耦合与弱耦合色超导
强耦合(BEC)情形
弱耦合(BCS)情形
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BEC和BCS配对的差异
fermionic
bosonic
Eb
T dependence
EF dependence
T independent
EF independent
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模型计算结果
能隙和有效化学势
费米子和玻色子数密度
x是BEC-BCS转换参数
x<0, BCS区域
X>0, BEC区域
Deng, Schmitt, Wang, nucl-th/0611097
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模型计算结果
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费米与玻色量子液体
Atomic systems
Atomic BEC (1995): Weakly interacting bose gas
Fermionic atom gas
Condensed matter system
Superconductor (1911)
4He (1937), 3He (1971)
High-Tc superconductor (1987)
1021cm-3
1012cm-3
1nK
100K
Density
Temp.
To bridge different regimes…
Weak interaction to strong interaction
Bosons to Fermions and vice versa
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实验装置
Efficient loading into the optical trap: ~ 1