Abstract
Non-symmorphic crystals are generating great interest as they are commonly found in quantum materials, like iron-based superconductors, heavy-fermion compounds, and topological semimetals. A new type of surface state, a floating band, was recently discovered in the nodal-line semimetal ZrSiSe, but also exists in many non-symmorphic crystals. Little is known about its physical properties. Here, we employ scanning tunneling microscopy to measure the quasiparticle interference of the floating band state on ZrSiSe (001) surface and discover rotational symmetry breaking interference, healing effect and half-missing-type anomalous Umklapp scattering. Using simulation and theoretical analysis we establish that the phenomena are characteristic properties of a floating band surface state. Moreover, we uncover that the half-missing Umklapp process is derived from the glide mirror symmetry, thus identify a non-symmorphic effect on quasiparticle interferences. Our results may pave a way towards potential new applications of nanoelectronics.
Highlights
Non-symmorphic crystals are generating great interest as they are commonly found in quantum materials, like iron-based superconductors, heavy-fermion compounds, and topological semimetals
Among all surface sensitive measurements, quasiparticle interference (QPI) which is acquired via scanning tunneling microscopy (STM) may be the most direct method to reveal the unique physics of surface states
In addition to the previously insightful QPI discoveries on ZrSiS25,26 and ZrSiSe27, we directly identify the characteristic properties of a floating band surface state
Summary
Non-symmorphic crystals are generating great interest as they are commonly found in quantum materials, like iron-based superconductors, heavy-fermion compounds, and topological semimetals. A new type of surface state, a floating band, was recently discovered in the nodal-line semimetal ZrSiSe, and exists in many non-symmorphic crystals. E.g., the prohibition of electron back scattering on a topological insulator surface[7,8], the tunable mass acquisition of surface fermions in a topological crystalline insulator[9] and the electronic sink effect in a Weyl semimetal[10,11,12,13] have been discerned through quasiparticle interference (QPI) approaches These have all been proven advances in the understanding of the unconventional twodimensional electron gases. This previously unknown surface state exists in a wide range of P4/nmm symmetric crystals which goes beyond topologically non-trivial materials. We apply a single-defect induced QPI (s-QPI) approach, which is of both experimental and theoretical challenge, to a b c
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