MagneticKP: A package for quickly constructing k·p models of magnetic and non-magnetic crystals
Abstract
We propose an efficient algorithm to construct k· p effective Hamiltonians, which is much faster than the previously proposed algorithms. This algorithm is implemented in MagneticKP package. The package applies to both single-valued (spinless) and double-valued (spinful) cases, and it works for both magnetic and nonmagnetic systems. By interfacing with SpaceGroupIrep or MSGCorep packages, it can directly output the k· p Hamiltonian around arbitrary momentum and expanded to arbitrary order in k.
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