New excitations in bcc 4He - an inelastic neutron scattering study
O. Pelleg, J. Bossy, E. Farhi, M. Shay, V. Sorkin, E. Polturak
Abstract
We report neutron scattering measurements on bcc solid 4% He. We studied the phonon branches and the recently discovered ''optic-like'' branch along the main crystalline directions. In addition, we discovered another, dispersionless "optic-like'' branch at an energy around 1 meV (~11K). The properties of the two "optic-like" branches seem different. Since one expects only 3 acoustic phonon branches in a monoatomic cubic crystal, these new branches must represent different type of excitations. One possible interpretation involves localized excitations unique to a quantum solid.
Create a lesson
Related papers
Current control of spin-wave transport in YIG via the VO2 insulator-to-metal transition
Aleksei A. Nikitin, Nikolai Kuznetsov, Lukáš Flajšman et al.
Continuum Dirac Theory and Nonlinear Extensions of a Chain of Alternating non-linear springs: an SSH version of the Fermi-Pasta-Ulam-Tsingou model
Gerardo G. Naumis, Ilder I. Salgado, Jorge Fujioka
Synchronization and Spatiotemporal Phases in Driven Precessing Domain Walls
Luz Pérez Herrera, Enzo Fabrizio Pusiol, Alejandro B. Kolton
Galilean electrodynamics fluctuation in a superfluid: from general coordinate invariance to Tkachenko mode
Neng-Chun Chiu, Tzu-Ken Shen, Siau Ihan
Anomalous response, re-emerging localization-transition and robust corner sates in self-similar peano fractal
Rhiddha Acharjee, Sayan Bhattacharya, Atanu Nandy et al.
Zeeman Spin Photocurrents without Spin Textures
Xihua Xiao, Ruizhi Dong, Ruixiang Fei