Journal
PHYSICAL REVIEW B
Volume 84, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.075325
Keywords
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Funding
- Alexander von Humboldt Foundation
- Federal Ministry of Education and Research
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When adiabatically varied in time, certain one-dimensional band insulators allow for the quantized noiseless pumping of spin even in the presence of strong spin-orbit scattering. These spin pumps are closely related to the quantum spin Hall system, and their properties are protected by a time-reversal restriction on the pumping cycle. In this paper we study pumps formed of one-dimensional insulators with a time-reversal restriction on the pumping cycle and a bulk energy gap which arises due to interactions. We find that the correlated gapped phase can lead to novel pumping properties. In particular, systems with d different ground states can give rise to d + 1 different classes of spin pumps, including a trivial class which does not pump quantized spin and d nontrivial classes allowing for the pumping of quantized spin (h) over bar /n on average per cycle, where 1 <= n <= d. We discuss an example of a spin pump that transfers an average of spin (h) over bar /2 without transferring charge.
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