arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1503.01516cond-mat.quant-gascond-mat.str-elcond-mat.supr-con
收藏

Nambu-Goldstone模隧穿中Higgs束缚态的Fano共振

Fano resonance through Higgs bound states in tunneling of Nambu-Goldstone modes

Takeru Nakayama, Ippei Danshita, Tetsuro Nikuni, Shunji Tsuchiya

摘要:

我们研究了超流玻色气体在光晶格中的集体模。我们假设系统处于量子相变附近,在一个相称的填充莫特绝缘体,出射的粒子-空穴对称性产生两种类型的集体模式,即一个无间隙的Nambu-Goldstone(NG)相模式和一个有间隙的Higgs振幅模式。我们考虑两种势垒:一种不破坏粒子-空穴对称性,另一种破坏粒子-空穴对称性。在前一个障碍的存在下,我们发现希格斯束缚态的结合能低于散装希格斯间隙和本地化周围的障碍。我们分析了NG模式入射到两个势垒的隧穿性质,表明后者的势垒耦合的Higgs束缚态与NG模式,导致Fano共振介导的束缚态。由于基础场论的普适性,希格斯束缚态也可能存在于其他具有粒子-空穴对称性和连续对称性自发破缺的凝聚态系统中,如量子二聚体反铁磁体、超导体和电荷密度波材料。

英文摘要:

We study collective modes of superfluid Bose gases in optical lattices combined with potential barriers. We assume that the system is in the vicinity of the quantum phase transition to a Mott insulator at a commensurate filling, where emergent particle-hole symmetry gives rise to two types of collective mode, namely a gapless Nambu-Goldstone (NG) phase mode and a gapful Higgs amplitude mode. We consider two kinds of potential barrier: One does not break the particle-hole symmetry while the other does. In the presence of the former barrier, we find Higgs bound states that have binding energies lower than the bulk Higgs gap and are localized around the barrier. We analyze tunneling properties of the NG mode incident to both barriers to show that the latter barrier couples the Higgs bound states with the NG mode, leading to Fano resonance mediated by the bound states. Thanks to the universality of the underlying field theory, it is expected that Higgs bound states may be present also in other condensed matter systems with a particle-hole symmetry and spontaneous breaking of a continuous symmetry, such as quantum dimer antiferromagnets, superconductors, and charge-density-wave materials.

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。

↑