Study Deepens Understanding of Quantum Transport in Topological Materials

Researchers observed unusual quantum oscillations in the topological insulator ZrTe₅ that persist beyond the quantum limit under extreme magnetic fields and near-zero temperatures. The study attributes the behavior to reentrant Landau levels caused by the interplay of electron spin, orbital motion and strong spin-orbit coupling rather than many-body interactions. The findings suggest that previously reported differences in ZrTe₅ oscillations may arise from the same underlying Dirac electronic structure, with carrier density and Fermi-surface size determining the observed behavior. Image: Electrical resistance of the topological insulator ZrTe₅ under extreme magnetic fields and at low temperatures; (b) Non-periodic or anomalous quantum oscillations observed in the high-field regime. (Cauê Kaufmann Ribeiro) PRESS RELEASE — In May, a study was published in Nature Communications that identified an unusual regime of quantum oscillations in a three-dimensional topological insulator.…