Collective Modes in a Quantum

被引：0

作者：

Gazit, Snir ^{[1
,2
]}

Podolsky, Daniel ^{[2
]}

Nonne, Heloise ^{[2
]}

Auerbach, Assa ^{[2
]}

Arovas, Daniel P. ^{[3
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Technion, Dept Phys, IL-32000 Haifa, Israel

[3] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 08期

基金：

以色列科学基金会;

关键词：

NEUTRON-SCATTERING; LATTICE EXCITATIONS; SOLID HELIUM; BCC HE-4; SUPERCONDUCTORS; TRANSITION; CRYSTAL; PHONONS; ENERGY; PHASE;

D O I：

10.1103/PhysRevLett.117.085302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We provide a theoretical explanation for the optical modes observed in inelastic neutron scattering on the bcc solid phase of helium 4 [T. Markovich et al., Phys. Rev. Lett. 88, 195301 (2002)]. We argue that these excitations are amplitude (Higgs) modes associated with fluctuations of the crystal order parameter within the unit cell. We present an analysis of the modes based on an effective Ginzburg-Landau model, classify them according to their symmetry properties, and compute their signature in inelastic neutron scattering experiments. In addition, we calculate the dynamical structure factor by means of an ab intio quantum Monte Carlo simulation and find a finite frequency excitation at zero relative momentum.

引用

页数：5

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