  Topological insulators (TIs) are expected to be a promising platform for
novel quantum phenomena, whose experimental realizations require sophisticated
devices. In this Technical Review, we discuss four topics of particular
interest for TI devices: topological superconductivity, quantum anomalous Hall
insulator as a platform for exotic phenomena, spintronic functionalities, and
topological mesoscopic physics. We also discuss the present status and
technical challenges in TI device fabrications to address new physics.
