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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster: Transport

TT 16.12: Poster

Montag, 27. März 2023, 15:00–18:00, P2/OG4

Electron correlation and confinement effects in quasi-one-dimensional quantum wires at high-densityAnkush Girdhar1, Vinod Ashokan1, Neil Drummond2, •Klaus Morawetz3,4, and Kare Narain Pathak51Department of Physics, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar (Punjab), 144 011, India — 2Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom — 3Münster University of Applied Sciences, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — 4International Institute of Physics- UFRN,Campus Universitário Lagoa nova,59078-970 Natal, Brazil — 5Centre for Advanced Study in Physics, Panjab University, 160014 Chandigarh, India

The correlation energy, pair-correlation function, static structure factor, and momentum density of ferromagnetic quasi-one-dimensional quantum wires are calculated using the quantum Monte Carlo (QMC) method for various wire widths b and density parameters rs. The peak in the static structure factor at k=2kF grows as the wire width decreases. The Tomonaga-Luttinger liquid parameter Kρ is found to increase by about 10% between wire widths b=0.01 and b=0.5. The ground-state properties of finite thickness wires is compared to the first-order random phase approximation (RPA), which is exact in the high-density limit. Analytical expressions for the static structure factor and correlation energy are derived.

[1] Eur. Phys. J. B 91 (2018) 29

[2] Phys. Rev. B 97 (2018) 155147

[3] Phys. Rev. B 101 (2020) 075130

[4] Phys. Rev. B 104 (2021) 035149

[5] Phys. Rev. B 105 (2022) 115140

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