Browsing by Subject "Quantum mechanics"
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(Sociedad Mexicana de Fisica, 2014)A mechanism that produces conical dispersion relations is presented. A Kronig Penney one dimensional array with two different strengths delta function potentials gives rise to both the gap closure and the dispersion relation ...
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(Società Italiana di Fisica, 1987)We introduce a new definition of symmetry transformations in quantum mechanics which contains the textbook definition as a special case. We find several conserved quantities associated with one (nonunitary) symmetry ...