Layered transition metal chalcogenides are promising hosts of electronic Weyl nodes and topological superconductivity. MoTe2 is a striking example that harbors both noncentrosymmetric Td and centrosymmetric T' phases, both of which have been identified as topologically nontrivial. Applied pressure tunes the structural transition separating these phases to zero temperature, stabilizing a mixed Td–T' matrix that entails a network of interfaces between the two nontrivial topological phases. Here, we show that this critical pressure range is characterized by distinct coherent quantum oscillations, indicating that the difference in topology between topologically nonvtrivial Td and T' phases gives rise to an emergent electronic structure: a network of topological interfaces. A rare combination of topologically nontrivial electronic structures and locked-in transformation barriers leads to this counterintuitive situation, wherein quantum oscillations can be observed in a structurally inhomogeneous material. These results further open the possibility of stabilizing multiple topological phases coexisting with superconductivity.
I. L. Liu and C. Heikes and T. Yildirim and C. Eckberg and T. Metz and H. Kim and S. Ran and W. D. Ratcliff and J. Paglione and For full list of authors, see publisher's website., "Quantum Oscillations from Networked Topological Interfaces in a Weyl Semimetal," npj Quantum Materials, vol. 5, no. 1, article no. 62, Nature Research, Dec 2020.
The definitive version is available at https://doi.org/10.1038/s41535-020-00264-8
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01 Dec 2020
National Science Foundation, Grant DE-SC-0019154