One-Dimensional Edge States with Giant Spin Splitting in a Bismuth Thin Film

Abstract

To realize a one-dimensional (1D) system with strong spin-orbit coupling is a big challenge in modern physics, since the electrons in such a system are predicted to exhibit exotic properties unexpected from the 2D or 3D counterparts, while it was difficult to realize genuine physical properties inherent to the 1D system. We demonstrate the first experimental result that directly determines the purely 1D band structure by performing spin-resolved angle-resolved photoemission spectroscopy of Bi islands on a silicon surface that contains a metallic 1D edge structure with unexpectedly large Rashba-type spin-orbit coupling suggestive of the nontopological nature. We have also found a sizable out-of-plane spin polarization of the 1D edge state, consistent with our first-principles band calculations. Our result provides a new platform to realize exotic quantum phenomena at the 1D edge of the strong spin-orbit-coupling systems.

References in corpus (7)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Half-Metallic Graphene Nanoribbons
• Strong spin-orbit splitting on Bi surfaces
• Quantum Spin Hall Effect and Enhanced Magnetic Response by Spin-Orbit Coupling
• One-dimensional Topological Edge States of Bismuth Bilayers
• Search for Majorana fermions in multiband semiconducting nanowires

Cited by in corpus (9)

• Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS
• Evidence for Higher order topology in Bi and Bi${}_{0.92}$Sb${}_{0.08}$
• Photo-induced electronic and spin topological phase transitions in monolayer bismuth
• 2D and 3D topological phases in BiTe$X$ compounds
• Long-lived Andreev states as evidence for protected hinge modes in a bismuth nanoring Josephson junction
• Edge States of α-Bismuthene Nanostructures
• STM observation of the hinge-states of bismuth nanocrystals
• Quantized Thermal Hall Conductance and the Topological Phase Diagram of a Superconducting Bismuth Bilayer
• Giant Rashba-Splitting of One-Dimensional Metallic States in Bi Dimer Lines on InAs(100)