论文标题
过压超氟He-4中的roton激发
Roton excitation in overpressurized superfluid He-4
论文作者
论文摘要
我们通过量子蒙特卡洛（QMC）模拟对HE-4的过度压力超氟阶段进行了理论研究。作为密度的函数，我们使用最大的熵来研究结构和超流体特性，并通过倒置QMC计算出的假想时间密度相关函数来估计Roton激发的能量。我们估计Roton能量消失的压力约为100 bar，我们用旋缺链密度识别，即存在亚稳态的超氟相位的上限。
We carry out a theoretical investigation of overpressurized superfluid phases of He-4 by means of quantum Monte Carlo (QMC) simulations. As a function of density, we study structural and superfluid properties, and estimate the energy of the roton excitation by inverting imaginary-time density correlation functions computed by QMC, using Maximum Entropy. We estimate the pressure at which the roton energy vanishes to be about 100 bars, which we identify with the spinodal density, i.e., the upper limit for the existence of a metastable superfluid phase.
