2012/01/31 by Miloslav Znojil, G. Lévai, Géza Lévai
Mathematics · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Quantum Mechanics and Non-Hermitian Physics #Quantum chaos and dynamical systems #math-ph #math.MP #quant-ph
paper · pdf · doi:10.1016/j.physleta.2012.09.021
published as Phys. Lett. A 376 (2012) 3000 - 3005 · 17 pp., 3 figs
arxiv created 2012/08/14 · openalex publication_date 2012/09/24 · arxiv updated 2014/02/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
The consistency of the concept of quantum (quasi)particles possessing effective mass which is both position- and excitation-dependent is analyzed via simplified models. It is shown that the system may be stable even when the effective mass m=m(x,E) itself acquires negative values in a limited range of coordinates x and energies E.