dorsal/arxiv
View SchemaRenormalization of the singular attractive $1/r^4$ potential
| Authors | Mary Alberg, Michel Bawin, Fabian Brau |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0412112 |
| URL | https://arxiv.org/abs/quant-ph/0412112 |
| DOI | 10.1103/PhysRevA.71.022108 |
| Journal | Phys. Rev. A 71, 022108 (2005) |
Abstract
We study the radial Schr\"odinger equation for a particle of mass $m$ in the field of a singular attractive $g^2/{r^4}$ potential with particular emphasis on the bound states problem. Using the regularization method of Beane \textit{et al.}, we solve analytically the corresponding ``renormalization group flow" equation. We find in agreement with previous studies that its solution exhibits a limit cycle behavior and has infinitely many branches. We show that a continuous choice for the solution corresponds to a given fixed number of bound states and to low energy phase shifts that vary continuously with energy. We study in detail the connection between this regularization method and a conventional method modifying the short range part of the potential with an infinitely repulsive hard core. We show that both methods yield bound states results in close agreement even though the regularization method of Beane \textit{et al.} does not include explicitly any new scale in the problem. We further illustrate the use of the regularization method in the computation of electron bound states in the field of neutral polarizable molecules without dipole moment. We find the binding energy of s-wave polarization bound electrons in the field of C$_{60}$ molecules to be 17 meV for a scattering length corresponding to a hard core radius of the size of the molecule radius ($\sim 3.37$ \AA). This result can be further compared with recent two-parameter fits using the Lennard-Jones potential yielding binding energies ranging from 3 to 25 meV.
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"abstract": "We study the radial Schr\\\"odinger equation for a particle of mass $m$ in the\nfield of a singular attractive $g^2/{r^4}$ potential with particular emphasis\non the bound states problem. Using the regularization method of Beane\n\\textit{et al.}, we solve analytically the corresponding ``renormalization\ngroup flow\" equation. We find in agreement with previous studies that its\nsolution exhibits a limit cycle behavior and has infinitely many branches. We\nshow that a continuous choice for the solution corresponds to a given fixed\nnumber of bound states and to low energy phase shifts that vary continuously\nwith energy. We study in detail the connection between this regularization\nmethod and a conventional method modifying the short range part of the\npotential with an infinitely repulsive hard core. We show that both methods\nyield bound states results in close agreement even though the regularization\nmethod of Beane \\textit{et al.} does not include explicitly any new scale in\nthe problem. We further illustrate the use of the regularization method in the\ncomputation of electron bound states in the field of neutral polarizable\nmolecules without dipole moment. We find the binding energy of s-wave\npolarization bound electrons in the field of C$_{60}$ molecules to be 17 meV\nfor a scattering length corresponding to a hard core radius of the size of the\nmolecule radius ($\\sim 3.37$ \\AA). This result can be further compared with\nrecent two-parameter fits using the Lennard-Jones potential yielding binding\nenergies ranging from 3 to 25 meV.",
"arxiv_id": "quant-ph/0412112",
"authors": [
"Mary Alberg",
"Michel Bawin",
"Fabian Brau"
],
"categories": [
"quant-ph",
"math-ph",
"math.MP",
"physics.atm-clus"
],
"doi": "10.1103/PhysRevA.71.022108",
"journal_ref": "Phys. Rev. A 71, 022108 (2005)",
"title": "Renormalization of the singular attractive $1/r^4$ potential",
"url": "https://arxiv.org/abs/quant-ph/0412112"
},
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