%0 Journal Article %A Bernard Helffer %A Ayman Kachmar %T Helical magnetic fields and semi-classical asymptotics of the lowest eigenvalue %J Documenta mathematica %D 2023 %P 857-901 %V 28 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/dm/922/ %R 10.4171/dm/922 %F 10_4171_dm_922