We introduce a general first-principles methodology for computing electronic structure in a finite uniform magnetic field that allows for an arbitrary rational magnetic flux and nonlocal pseudopotentials at a comparable time complexity to conventional plane-wave pseudopotential approaches in zero-field conditions. The versatility of this method is demonstrated through comprehensive applications to both molecular and crystalline systems, including calculations of magnetizabilities, magnetically induced currents, and magnetic energy bands. Furthermore, we provide rigorous proofs of two properties for crystals in uniform magnetic fields: the “strong translational symmetry” and “magnetic band shift” phenomena.

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• Electronic structure
• High magnetic fields
• First-principles calculations