activity
20242026
collaborators

5 papers

math.SP2026

On two-dimensional Dirac operators with critical delta-shell interactions

William Borrelli, Pietro Carimati, Davide Fermi

We study two-dimensional Dirac operators with singular interactions of electrostatic and Lorentzscalar type, supported either on a straight line or a circle. For certain critical v…

math-ph2026

The Pauli-Villars-regularized Dirac vacuum in electromagnetic fields at positive temperature

William Borrelli, Umberto Morellini

In this paper we consider a model of the Dirac vacuum in classical electromagnetic fields at positive temperature. We adopt the Pauli-Villars regularisation technique in order to p…

math.AP2025

Dirac solitons in one-dimensional nonlinear Schrödinger equations

William Borrelli, Elena Danesi, Simone Dovetta +1

In this paper we study a family of one-dimensional stationary cubic nonlinear Schrödinger (NLS) equations with periodic potentials and linear part displaying Dirac points in the d…

math-ph2025

Global well-posedness in a Hartree-Fock model for graphene

William Borrelli, Umberto Morellini

Graphene is a monolayer graphitic film in which electrons behave like two-dimensional Dirac fermions without mass. Its study has attracted a wide interest in the domain of condense…

math-ph2024

Pauli Hamiltonians with an Aharonov-Bohm Flux

William Borrelli, Michele Correggi, Davide Fermi

We study a two-dimensional Pauli operator describing a charged quantum particle with spin moving on a plane in presence of an orthogonal Aharonov-Bohm magnetic flux. We class…