A Topological Spin Chern Pump

Abstract

We propose a one-dimensional electron model with parameters modulated adiabatically in closed cycles, which can continuously pump spin to leads. By defining the spin-polarized Wannier functions, we show that the spin pump is protected by the spin Chern numbers, so that it is stable to perturbations violating the time-reversal symmetry and spin conservation. Our work demonstrates the possibility and principle to realize topological spin pumps independent of any symmetries, and also suggests a possible way to experimentally observe the bulk topological invariants.

5 pages, 3 figures

References in corpus (9)

• Topological Insulators with Inversion Symmetry
• Time Reversal Polarization and a Z_2 Adiabatic Spin Pump
• Quantum Spin Hall Effect and Topologically Invariant Chern Numbers
• Robustness of the Spin-Chern number
• Microwave-driven ferromagnet--topological-insulator heterostructures: The prospect for giant spin battery effect and quantized charge pump devices
• Adiabatic spin pumping through a quantum dot with a single orbital level
• Stabilization of Quantum Spin Hall Effect by Designed Removal of Time-Reversal Symmetry of Edge States
• Pumping in a mesoscopic ring with Ahronov-Casher effect
• Adiabatic pumping through a quantum dot in the Kondo regime: Exact results at the Toulouse limit

Cited by in corpus (8)

• Thouless pumping and topology
• Spin pumping and measurement of spin currents in optical superlattices
• Spin Chern Pumping from the Bulk of Two-Dimensional Topological Insulators
• Non-adiabatic topological spin pumping
• Topological Spin and Valley Pumping in Silicene
• Fractional quantization of charge and spin in topological quantum pumps
• Phase diagram and topology of the XXZ chain with alternating bonds and staggered magnetic field
• Anisotropy-driven topological quantum phase transition in magnetic impurities