2021/03/31 by Zhandos A. Moldabekov, Zh. A. Moldabekov, T. Dornheim +8 · 20 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Cold Atom Physics and Bose-Einstein Condensates #Fermion #Perturbation (astronomy) #Perturbation theory (quantum mechanics) #Physics #Quantum #Quantum mechanics #Quantum, superfluid, helium dynamics #Statistical physics #cond-mat.quant-gas #cond-mat.str-el #physics.plasm-ph
paper · pdf · doi:10.21468/scipostphys.12.2.062
published in SciPost Physics 12(2) (SciPost.org)
arxiv created 2021/04/22 · openalex publication_date 2022/02/16 · arxiv updated 2022/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Correlated many-fermion systems emerge in a broad range of phenomena in warm dense matter, plasmonics, and ultracold atoms. Quantum hydrodynamics (QHD) complements first-principles methods for many-fermion systems at larger scales. We illustrate the failure of the standard Bohm potential central to QHD for strong perturbations when the density perturbation is larger than about 10-3 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>3</mml:mn> </mml:mrow> </mml:msup> </mml:math> of the mean density. We then extend QHD to this regime via the many-fermion Bohm potential from first-principles. This may lead to more accurate QHD simulations beyond their common application domain in the presence of strong perturbations at scales unattainable with first-principles methods.