arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.1760cond-mat.str-elhep-th
收藏

有限化学势下QED $_{3}$中非费米液体行为的归宿

Fate of non-Fermi liquid behavior in QED$_{3}$ at finite chemical potential

Jing-Rong Wang, Guo-Zhu Liu

摘要:

在零温度和零化学势条件下,由于规范场的作用,二维无质量狄拉克费米子的阻尼率表现为非费米液体行为$\propto ε^{1/2}$。我们研究的命运,这种行为在有限的化学势。我们首先明确地计算了真空极化函数的时间和空间分量。解析表达式表明,规范场的时间分量在有限化学势下发展出一个静态屏蔽长度,而横向分量由于规范不变性而保持长程不变。然后计算了费米子的阻尼率,结果表明在零温下,时间规范场导致正常的费米液体行为,而横向规范场导致非费米液体行为$\propto ε^{2/3}$.这种能量依赖性比$\propto ε^{1/2}$更有规律,并且不随化学势的变化而变化。

英文摘要:

The damping rate of two-dimensional massless Dirac fermions exhibit non-Fermi liquid behavior, $\propto ε^{1/2}$, due to gauge field at zero temperature and zero chemical potential. We study the fate of this behavior at finite chemical potential. We fist calculate explicitly the temporal and spatial components of vacuum polarization functions. The analytical expressions imply that the temporal component of gauge field develops a static screening length at finite chemical potential while the transverse component remains long-ranged owing to gauge invariance. We then calculate the fermion damping rate and show that the temporal gauge field leads to normal Fermi liquid behavior but the transverse gauge field leads to non-Fermi liquid behavior $\propto ε^{2/3}$ at zero temperature. This energy-dependence is more regular than $\propto ε^{1/2}$ and does not change as chemical potential varies.

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。

↑