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The critical point of a topological phase transition is described by aconformal field theory, where finite-size corrections to energy are uniquelyrelated to its central charge. We investigate the finite-size scaling away fromcriticality and find a scaling function, which discriminates between phaseswith different topological indexes. This function appears to be universal forall five Altland-Zirnbauer symmetry classes with non-trivial topology in onespatial dimension. We obtain an analytic form of the scaling function andcompare it with numerical results.

Universal Finite-Size Scaling around Topological Quantum Phase Transitions