Probing topologically enhanced interface magnetism

Topologically nontrivial materials are a material class which has emerged over the past decade+ as a critical area of research due to promise for ultra-low power computing or fault-tolerant quantum devices. As the classes of accessible topological materials have expanded, transitions between topological states may enable a wide range of new devices. In particular, the Dirac semimetal ZrTe5 is near a transition to both weak and strong topological insulating states, which may enable tuning in and out of macroscopic quantum transport conditions. Here, we propose to study the introduction of magnetic order in to ZrTe5 by the magnetic insulator EuS, as the time-reversal symmetry breaking induced by magnetic order at the surface is crucial to realizing the quantum anomalous Hall state in this material.