Viñas Gausí, XavierRoth, R.Schuck, PeterWambach, J.2009-10-062009-10-0620011050-2947https://hdl.handle.net/2445/9559The quantum-kinetic energy of a finite number of trapped fermionic atoms provides a restoring force for shear motion due to a distortion of the momentum distribution. In analogy to the twist mode of nuclear physics, it is proposed that counter rotating the upper and lower hemisphere of a spherical atomic cloud yields a finite-frequency mode closely related to transverse zero sound waves in bulk Fermi liquids.3 p.application/pdfeng(c) The American Physical Society, 2001Constitució de la matèriaMecànica estadísticaGas d'electronsConstitution of matterStatistical mechanicsElectron gasinfo:eu-repo/semantics/article181368info:eu-repo/semantics/openAccess