NEW BOUNDARY CRITICAL PHENOMENON AT THE METAL-QUANTUM SPIN HALL INSULATOR TRANSITION

摘要

We investigate bulk and boundary multifractality at the metal-quantum spin Hall (QSH) insulator transition driven by disorder in two-dimensions. Recently, we have shown that boundary multifractality at this transition is different from that of the symplectic class by using the network model with random spin-orbit interactions. To give the another evidence for this result, we investigate multifractality at the metal-QSH insulator transition by using a different model, namely, the network model with a constant spin-orbit interaction. It is found that bulk multifractality at the metal-QSH insulator transition is that of the symplectic class while boundary multifractality is different, confirming identical with the previous result.