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arXiv 1502.00431cond-mat.quant-gas
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可调相互作用费米子超流体中Higgs模的演化

Evolution of Higgs mode in a Fermion Superfluid with Tunable Interactions

Boyang Liu, Hui Zhai, Shizhong Zhang

摘要:

在这封信中,我们提出了一个连贯的图片的希格斯模式在中性和带电的$s$波费米子超流体的演变,费米子之间的吸引力的相互作用的强度增加,从BCS到BEC制度。在中性费米子超流体的情况下,如超冷费米子,希格斯模式被推到更高的能量,同时随着相互作用强度向BEC区域增加,逐渐失去其光谱权重,因为系统进一步远离洛伦兹不变性。另一方面,当考虑阻尼时,由于在整个BEC-BCS交叉中与相模的耦合,Higgs模显著展宽。在电子超导体带电的情况下,Anderson-Higgs机制使相模消失,抑制了Higgs模和相模之间的耦合,从而稳定了Higgs模。

英文摘要:

In this letter we present a coherent picture for the evolution of Higgs mode in both neutral and charged $s$-wave fermion superfluids, as the strength of attractive interaction between fermions increases from the BCS to the BEC regime. In the case of neutral fermionic superfluid, such as ultracold fermions, the Higgs mode is pushed to higher energy while at the same time, gradually loses its spectral weight as interaction strength increases toward the BEC regime, because the system is further tuned away from Lorentz invariance. On the other hand, when damping is taken into account, Higgs mode is significantly broadened due to coupling to phase mode in the whole BEC-BCS crossover. In the charged case of electron superconductor, the Anderson-Higgs mechanism gaps out the phase mode and suppresses the coupling between the Higgs and the phase modes, and consequently, stabilizes the Higgs mode.

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。

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