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Universal Finite-Size Scaling around Topological Quantum Phase Transitions
Tobias Gulden1, Michael Janas1, Yuting Wang1
1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Abstract:
The critical point of a topological phase transition is described by a conformal field theory, where finite-size corrections to energy are uniquely related to its central charge. We investigate the finite-size scaling away from criticality and find a scaling function, which discriminates between phases with different topological indices. This function appears to be universal for all five Altland-Zirnbauer symmetry classes with nontrivial topology in one spatial dimension. We obtain an analytic form of the scaling function and compare it with numerical results.
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