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This paper is devoted to the asymptotic analysis of the eigenvalues of the Laplace operator with a strong magnetic field and Robin boundary condition on a smooth planar domain and with a negative boundary parameter. We study the singular…

Spectral Theory · Mathematics 2022-02-15 Rayan Fahs

We determine accurate asymptotics of the lowest eigenvalue for the Laplace operator with a smooth magnetic field and Robin boundary conditions in a smooth 3D domain, when the Robin parameter tends to $+\infty$. Our results identify a…

Spectral Theory · Mathematics 2020-05-11 Bernard Helffer , Ayman Kachmar , Nicolas Raymond

We consider the magnetic Robin Laplacian with a negative boundary parameter. Among a certain class of domains, we prove that the disk maximizes the ground state energy under the fixed perimeter constraint provided that the magnetic field is…

Spectral Theory · Mathematics 2022-05-03 Ayman Kachmar , Vladimir Lotoreichik

We determine a counterexample to strong diamagnetism for the Laplace operator in the unit disc with a uniform magnetic field and Robin boundary condition. The example follows from the accurate asymptotics of the lowest eigenvalue when the…

Spectral Theory · Mathematics 2020-08-26 Ayman Kachmar , Mikael P. Sundqvist

This article tackles the spectral analysis of the Robin Laplacian on a smooth bounded two-dimensional domain in the presence of a constant magnetic field. In the semiclassical limit, a uniform description of the spectrum located between the…

Mathematical Physics · Physics 2023-09-01 Rayan Fahs , Loïc Le Treust , Nicolas Raymond , San Vu Ngoc

The core result of this paper is an upper bound for the ground state energyof the magnetic Laplacian with constant magnetic field on cones that are contained in ahalf-space. This bound involves a weighted norm of the magnetic field related…

Spectral Theory · Mathematics 2017-11-23 Virginie Bonnaillie-Noël , Monique Dauge , Nicolas Popoff , Nicolas Raymond

We consider the pseudorelativistic no-pair Brown-Ravenhall operator for the description of relativistic one-electron ions in a homogeneous magnetic field B. It is shown for central charge not exceeding Z=87 that their ground state energy…

Mathematical Physics · Physics 2015-05-13 D. H. Jakubassa-Amundsen

This paper is devoted to the asymptotic analysis of the optimal Sobolev constants in the semiclassical limit and in any dimension. We combine semiclassical arguments and concentration-compactness estimates to tackle the case when an…

Analysis of PDEs · Mathematics 2018-08-21 Soeren Fournais , Loïc Le Treust , Nicolas Raymond , Jean Van Schaftingen

This paper is concerned with spectrum properties of the magnetic Laplacian with a higher-order vanishing magnetic field in a bounded domain. We study the asymptotic behaviors of ground state energies for the Dirichlet Laplacian, the Neumann…

Analysis of PDEs · Mathematics 2025-05-07 Zhongwei Shen

We determine accurate asymptotics for the low-lying eigenvalues of the Robin Laplacian when the Robin parameter goes to $-\infty$. The two first terms in the expansion have been obtained by K. Pankrashkin in the $2D$-case and by K.…

Spectral Theory · Mathematics 2015-04-30 Bernard Helffer , Ayman Kachmar

This paper concerns the shape optimization problem of minimizing the ground state energy of the magnetic Dirichlet Laplacian with constant magnetic field among three-dimensional domains of fixed volume. In contrast to the two-dimensional…

Mathematical Physics · Physics 2025-11-14 Matthias Baur

Inspired by a paper by T. Chakradhar, K. Gittins, G. Habib and N. Peyerimhoff, we analyze their conjecture that the ground state energy of the magnetic Dirichlet-to-Neumann operator tends to infinity as the magnetic field tends to infinity.…

Mathematical Physics · Physics 2025-01-15 Bernard Helffer , Ayman Kachmar , Francois Nicoleau

The purpose of this paper is to derive sharp asymptotics of the ground state energy for the heavy atoms and molecules in the relativistic settings, with the self-generated magnetic field, and, in particular, to derive relativistic Scott…

Spectral Theory · Mathematics 2017-08-28 Victor Ivrii

We consider the semi-classical Dirichlet Pauli operator in bounded connected domains in the plane. Rather optimal results have been obtained in previous papers by Ekholm-Kova\v{r}\'ik-Portmann and Helffer-Sundqvist for the asymptotics of…

Spectral Theory · Mathematics 2018-12-20 Bernard Helffer , Hynek Kovařík , Mikael P. Sundqvist

In this article, we consider fixed spin 1/2 particles interacting through the quantized electromagnetic field in a constant magnetic field. We give some asymptotic expansions for the ground state and the ground state energy of the…

Mathematical Physics · Physics 2016-03-29 Laurent Amour , Jean Nourrigat

We study the ground state energy of a system of N fermions with two spin states in the large N limit. The particles are placed in an inhomogeneous trapping potential and interact via scaled interactions. We study a dilute limit where the…

Mathematical Physics · Physics 2025-10-27 Thomas Gamet

We study the ground state energy of the Neumann magnetic Laplacian on planar domains. For a constant magnetic field we consider the question whether, under an assumption of fixed area, the disc maximizes this eigenvalue. More generally, we…

Spectral Theory · Mathematics 2018-05-16 Soeren Fournais , Bernard Helffer

We consider asymptotics of the ground state energy of heavy atoms and molecules in the strong external magnetic field and derive it including Schwinger and Dirac corrections (if magnetic field is not too strong). We also consider related…

Mathematical Physics · Physics 2017-03-29 Victor Ivrii

We consider the three-dimensional Laplacian with a magnetic field created by an infinite rectilinear current bearing a constant current. The spectrum of the associated hamiltonian is the positive half-axis as the range of an infinity of…

Analysis of PDEs · Mathematics 2014-02-20 Vincent Bruneau , Nicolas Popoff

Under certain simplifying conditions we detect monotonicity properties of the ground-state energy and the canonical-equilibrium density matrix of a spinless charged particle in the Euclidean plane subject to a perpendicular, possibly…

Quantum Physics · Physics 2009-11-07 Hajo Leschke , Rainer Ruder , Simone Warzel
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