通过相互作用调制激发强相互作用费米气体中的 Higgs 模
Exciting the Higgs mode in a strongly-interacting Fermi gas by interaction modulation
AI总结：
本研究通过周期性调制相互作用强度，在强相互作用费米气体中激发了 Higgs 模，发现低温共振频率与配对能隙的局部密度近似相符，且频率和线宽随温度无显著变化。
摘要：
我们研究了处于费米和玻色超流体交叉区内的强相互作用费米气体的 Higgs 模。通过周期性调制气体的相互作用强度，我们参数化地激发了 Higgs 模，并研究了其共振频率和线宽随相互作用强度与温度的函数关系。我们发现低温下的共振频率与配对能隙的局部密度近似相符。频率和线宽均未表现出随温度的显著变化，这在理论上是出乎意料的，但在定性上与近期另一项研究相符。
英文摘要：
We study the Higgs mode of a strongly-interacting Fermi gas in the crossover regime between a fermionic and bosonic superfluid. By periodically modulating the interaction strength of the gas, we parametrically excite the Higgs mode and study its resonance frequency and line width as a function of both interaction strength and temperature. We find that the resonance frequency at low temperature agrees with a local-density approximation of the pairing gap. Both frequency and line width do not exhibit a pronounced variation with temperature, which is theoretically unexpected, however, in qualitative agreement with a different recent study.
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