Abstract
We present two families of lattice theta functions accompanying the family of lattice theta functions studied by Montgomery in [H. Montgomery, Minimal theta functions. Glasgow Mathematical Journal, 30 (1988), 75–85]. The studied theta functions are generalizations of the Jacobi theta-2 and theta-4 functions. Contrary to Montgomery’s result, we show that, among lattices, the hexagonal lattice is the unique maximizer of both families of theta functions. As an immediate consequence, we obtain a new universal optimality result for the hexagonal lattice among two-dimensional alternating charged lattices and lattices shifted by the center of their unit cell.
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Laurent Bétermin was part of the Faculty of Mathematics, University of Vienna, Austria at the time of writing and was supported by the Vienna Science and Technology Fund (WWTF) MA14-009 as well as the Austrian Science Fund (FWF) project F65.
Markus Faulhuber was with the Department of Mathematics, RWTH Aachen University, Germany at the time of writing and was partially supported by the Vienna Science and Technology Fund (WWTF) VRG12-009 and the Austrian Science Fund (FWF) P33217 and TAI6.
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Bétermin, L., Faulhuber, M. Maximal theta functions universal optimality of the hexagonal lattice for Madelung-like lattice energies. JAMA 149, 307–341 (2023). https://doi.org/10.1007/s11854-022-0254-z
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DOI: https://doi.org/10.1007/s11854-022-0254-z