Stability and semiclassics in self-generated fields

László Erdős ; Søren Fournais ; Jan Philip Solovej

Journal of the European Mathematical Society, Tome 15 (2013) no. 6, pp. 2093-2113.

Résumé

We consider non-interacting particles subject to a fixed external potential V and a self-generated magnetic field B. The total energy includes the field energy β∫B2 and we minimize over all particle states and magnetic fields. In the case of spin-1/2 particles this minimization leads to the coupled Maxwell-Pauli system. The parameter β tunes the coupling strength between the field and the particles and it effectively determines the strength of the field. We investigate the stability and the semiclassical asymptotics, h→0, of the total ground state energy E(β,h,V). The relevant parameter measuring the field strength in the semiclassical limit is κ=βh. We are not able to give the exact leading order semiclassical asymptotics uniformly in κ or even for fixed κ. We do however give upper and lower bounds on E with almost matching dependence on κ. In the simultaneous limit h→0 and κ→∞ we show that the standard non-magnetic Weyl asymptotics holds. The same result also holds for the spinless case, i.e. where the Pauli operator is replaced by the Schrödinger operator.

Détail

DOI : 10.4171/jems/416

Classification : 35-XX, 81-XX
Keywords: semiclassical eigenvalue estimate, Maxwell-Pauli system, Scott correction