Coexistence of Ferroelectric-like Polarization and Dirac-like Surface State in TaNiTe5

Abstract

By combining angle-resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy (STM), piezoresponse force microscopy (PFM) and first-principles calculations, we have studied the low-energy band structure, atomic structure and charge polarization on the surface of a topological semimetal candidate TaNiTe5. Dirac-like surface states were observed on the (010) surface by ARPES, consistent with the first-principles calculations. On the other hand, PFM reveals a switchable ferroelectric-like polarization on the same surface. We propose that the noncentrosymmetric surface reconstruction observed by STM could be the origin of the observed ferroelectric-like state in this novel material. Our findings provide a new platform with the coexistence of ferroelectric-like surface charge distribution and novel surface states.

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• Ferroelectric Instability under Screened Coulomb Interactions
• Metallic "Ferroelectricity" in the Pyrochlore Cd2Re2O7
• Low-energy Electron Reflectivity from Graphene
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Cited by in corpus (2)

• A newly-designed femtosecond KBe${}_2$BO${}_3$F${}_2$ device with pulse duration down to 55 fs for time- and angle-resolved photoemission spectroscopy
• Anisotropic superconductivity in the quasi-one-dimensional superconductor V${}_2$Ga${}_5$