Department of Physics and Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, D-80333 München, Germany.
Phys Rev Lett. 2012 Jul 6;109(1):010401. doi: 10.1103/PhysRevLett.109.010401.
We present solid evidence for the existence of a well-defined Higgs amplitude mode in two-dimensional relativistic field theories based on analytically continued results from quantum Monte Carlo simulations of the Bose-Hubbard model in the vicinity of the superfluid-Mott insulator quantum critical point, featuring emergent particle-hole symmetry and Lorentz invariance. The Higgs boson, seen as a well-defined low-frequency resonance in the spectral density, is quickly pushed to high energies in the superfluid phase and disappears by merging with the broad secondary peak at the characteristic interaction scale. Simulations of a trapped system of ultracold (87)Rb atoms demonstrate that the low-frequency resonance is lost for typical experimental parameters, while the characteristic frequency for the onset of a strong response is preserved.
我们提出了确凿的证据，证明在二维相对论场论中存在一个明确的希格斯幅度模式，该模式基于玻色-哈伯德模型在超流-莫特绝缘量子临界点附近的量子蒙特卡罗模拟的解析延拓结果，具有新兴的粒子-空穴对称性和洛伦兹不变性。希格斯玻色子在谱密度中被视为一个明确的低频共振，在超流相中很快被推到高能，并通过与特征相互作用尺度上的宽二次峰合并而消失。对囚禁的超冷 (87)Rb 原子系统的模拟表明，对于典型的实验参数，低频共振会丢失，而强响应开始的特征频率则得以保留。
