  Topological insulators are expected to be a promising platform for exciting
quantum phenomena, whose experimental realizations require sophisticated
devices. However, topological-insulator materials are generally more delicate
than conventional semiconductor materials and the fabrication of high-quality
devices has been a challenge. In this Expert Recommendation, we discuss the
nature of this challenge and present useful tips for successful device
fabrications, taking superconducting and ferromagnetic devices as concrete
examples. We also recommend some promising future directions.
