Abstract
The point-contact spectroscopy was first used to study the elementary excitation in solid materials. Then it is widely used to probe the superconducting order parameters when Andreev reflection occurs at the superconductor/normal metal interfaces. With the development of topological materials and topological superconducting materials, it has also played an important role in the detection of the possible topological superconducting order parameters. Especially in recent years, the so-called tip-induced superconductivity has been detected on the surface of various topological semimetals by point-contact, which adds a new application scope to this classical experimental method. In this review, we try to introduce its basic principles and the development, as well as the applications in some fields. Then some respective studies of the topological superconductor candidates and the recently discovered tip-induced superconductivity by point-contact in various topological materials are also briefly reviewed.
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