Experimental Progress on Layered Topological Semimetals

TL;DR

This paper reviews recent experimental advances in layered topological semimetals, highlighting their rich electronic states, topological phases, and potential for future applications in 2D heterostructures.

Contribution

It provides a comprehensive overview of material synthesis, characterization, and experimental findings on layered topological materials, emphasizing their topological phases and experimental techniques.

Findings

Identification of Dirac/Weyl semimetal phases in multilayers

Observation of quantum spin Hall insulator phases in monolayers

Advances in experimental techniques like ARPES and transport measurements

Abstract

We review recent experimental progresses on layered topological materials, mainly focusing on transitional metal dichalcogenides with various lattice types including 1T, Td and 1T' structural phases. Their electronic quantum states are interestingly rich, and many appear to be topological nontrivial, such as Dirac/Weyl semimetallic phase in multilayers and quantum spin hall insulator phase in monolayers. The content covers recent major advances from material synthesis, basic characterizations, angle-resolved photoemission spectroscopy measurements, transport and optical responses. Following those, we outlook the exciting future possibilities enabled by the marriage of topological physics and two dimensional van der Waals layered heterostructures.