无质量狄拉克费米子系统中的Higgs振幅模
Higgs amplitude mode in massless Dirac fermion systems
摘要：
超导体中的希格斯振幅模是粒子物理学中希格斯玻色子的凝聚态类比。研究了无质量Dirac系统中由吸引相互作用的弱猝灭引起的Higgs振幅模的时间演化。我们发现半填充蜂窝晶格中的Higgs振幅模具有对数衰减行为，这与正常超导体中的$1/\sqrt{t}$衰减性质不同.我们的研究也扩展到蜂窝晶格中的掺杂情况。对于半填充的3D Dirac半金属，我们得到了振幅模的无阻尼振荡。这一发现不仅是对以往正常费米子系统理论研究的重要补充，而且为二维或三维Dirac系统的超导性提供了实验依据.
英文摘要：
The Higgs amplitude mode in superconductors is the condensed matter analogy of Higgs bosons in particle physics. We investigate the time evolution of Higgs amplitude mode in massless Dirac systems, induced by a weak quench of an attractive interaction. We find that the Higgs amplitude mode in the half-filling honeycomb lattice has a logarithmic decaying behaviour, qualitatively different from the $1/\sqrt{t}$ decay in the normal superconductors. Our study is also extended to the doped cases in honeycomb lattice. As for the 3D Dirac semimetal at half filling, we obtain an undamped oscillation of the amplitude mode. Our finding is not only an important supplement to the previous theoretical studies on normal fermion systems, but also provide an experimental signature to characterize the superconductivity in 2D or 3D Dirac systems.
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。
