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Natural SciencesPhysicsCondensed Matter PhysicsQuantum MechanicsSpectroscopyAb Initio MethodsDensity Functional TheoryElectronic Band StructureLow-dimensional SolidsStrongly Correlated Electron SystemsTwo-dimensional SemiconductorsBand DegeneracyDegenerate StatesDensity Of StatesTwo-dimensional Electron GasesTwo-dimensional Electron Systems