Hyperfine coupling and spin polarization in the bulk of the topological insulator Bi${}_2$Se${}_3$

Abstract

Nuclear magnetic resonance (NMR) and transport measurements have been performed at high magnetic fields and low temperatures in a series of $n$-type Bi${}_2$Se${}_3$ crystals. In low density samples, a complete spin polarization of the electronic system is achieved, as observed from the saturation of the isotropic component of the ${}^{209}$Bi NMR shift above a certain magnetic field. The corresponding spin splitting, defined in the phenomenological approach of a 3D electron gas with a large (spin-orbit-induced) effective $g$-factor, scales as expected with the Fermi energy independently determined by simultaneous transport measurements. Both the effective electronic $g$-factor and the "contact" hyperfine coupling constant are precisely determined. The magnitude of this latter reveals a non negligible $s$-character of the electronic wave function at the bottom of the conduction band. Our results show that the bulk electronic spin polarization can be directly probed via NMR and pave the way for future NMR investigations of the electronic states in Bi-based topological insulators.

arXiv commentUpdated version including the supplemental material section. To be published in Rapid Communication, Phys. Rev. B

References in corpus (13)

• Topological Insulators
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Spintronics and Pseudospintronics in Graphene and Topological Insulators
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Angular-dependent oscillations of the magnetoresistance in Bi_2Se_3 due to the three-dimensional bulk Fermi surface
• Unraveling the spin polarization of the v = 5/2 fractional quantum Hall state
• In-Plane Orbital Texture Switch at the Dirac Point in the Topological Insulator Bi2Se3
• Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots
• NMR probing of the spin polarization of the nu=5/2 quantum Hall state
• Ultraslow Electron Spin Dynamics in GaAs Quantum Wells Probed by Optically Pumped NMR
• Probing the wavefunction of the surface states in Bi${}_2$Se${}_3$ topological insulator: a realistic tight-binding approach
• Nuclear magnetic resonance as a probe of electronic states of Bi2Se3
• Spin-lattice relaxation in bismuth chalcogenides

Cited by in corpus (16)

• Anisotropic and strong negative magneto-resistance in the three-dimensional topological insulator Bi2Se3
• Observation of Zeeman effect in topological surface state with distinct material dependence
• Emergent Weyl fermion excitations in TaP explored by 181-Ta quadrupole resonance
• Strong interband Faraday rotation in 3D topological insulator Bi2Se3
• ${}^{77}$Se nuclear magnetic resonance of topological insulator Bi${}_2$Se${}_3$
• Tight-binding theory of NMR shifts in topological insulators Bi2Se3 and Bi2Te3
• Nanoscale $\beta$-Nuclear Magnetic Resonance Depth Imaging of Topological Insulators
• Ionic and electronic properties of the topological insulator Bi${}_2$Te${}_2$Se investigated using $\beta$-detected nuclear magnetic relaxation and resonance of ${}^8$Li
• Unusual ${}^{209}$Bi NMR quadrupole effects in topological insulator Bi${}_2$Se${}_3$
• The hole Fermi surface in Bi${}_2$Se${}_3$ probed by quantum oscillations
• Limitation of electron mobility from hyperfine interaction in ultra-clean quantum wells and topological insulators
• Dynamic nuclear spin polarization induced by Edelstein effect at Bi(111) surfaces
• Dynamic Nuclear Polarization from Topological Insulator Helical Edge States
• NMR in an electric field: A bulk probe of the hidden spin and orbital polarizations
• Field induced charge symmetry in topological insulator Bi${}_2$Te${}_3$ revealed by nuclear magnetic resonance
• Resistively detected NMR as a probe of the topological nature of conducting edge/surface states