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Electronic structure of the topological superconductor candidate Au2Pb

TitleElectronic structure of the topological superconductor candidate Au2Pb
Publication TypeJournal Article
Year of Publication2018
AuthorsWu, Y, Drachuck, G, Wang, LL, Johnson, DD, Swatek, P, Schrunk, B, Mou, DX, Huang, LN, Bud'ko, SL, Canfield, PC, Kaminski, A
JournalPhysical Review B
Date Published10
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000446903500001
Keywordsdiscovery, Fermi arcs, insulator, physics, semimetal, simple scheme, single dirac cone, solution growth, surface-band calculations, total-energy calculations, wave basis-set

We use magnetization measurements, high-resolution angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations to study the electronic properties of Au2Pb, a topological superconductor candidate. The magnetization measurements reveal three discontinuities at 40, 51, and 99 K that agree well with reported structural phase transitions. To measure the band structure along desired crystal orientations, we utilized polishing, sputtering, and annealing to obtain clean flat sample surfaces. ARPES measurements of the Au2Pb (111) surface at 110 K shows a shallow hole pocket at the center and flower-petal-like surface states at the corners of the Brillouin zone. These observations match the results of DFT calculations relatively well. The flower-petal-like surface states appear to originate from a Dirac-like dispersion close to the zone corner. For the Au2Pb (001) surface at 150 K, ARPES reveals at least one electron pocket between the F and M points, consistent with the DFT calculations. Our results provide evidence for the possible existence of a Dirac state in this material.

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Complex States

Alternate JournalPhys. Rev. B