Higgs mode in (2+1)-dimensional O(2) model

被引：0
|
作者：
Yang, Ji-Chong [1 ,2 ,3 ]
Shi, Yu [1 ,2 ]
机构：
[1] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[2] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
[3] Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2021年 / 35卷 / 32期
关键词：
Higgs mode; O(2) model; Bosons; optical lattice; spontaneous symmetry breaking; MATHEMATICA PACKAGE; INTEGRALS;
D O I：
10.1142/S0217979221503331
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
In this paper, we investigate the spectral functions of the Higgs mode in O(2) model, which can be experimentally realized in a two-dimensional Bose gas. Zero temperature limit is considered. Our calculation fully includes the 2-loop contributions. Peaks show up in the spectral functions of both the longitudinal and the scalar susceptibilities. Thus, this model cannot explain the disappearance of the response at the weak interaction limit. Neither it can explain the similarity between the longitudinal and the scalar susceptibilities in the visibility of the Higgs mode. A possible lower peak at about 2m(sigma) is also noted.
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页数：52
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