Journal
PHYSICAL REVIEW B
Volume 84, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.014503
Keywords
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Funding
- National Science Foundation [DMR-0907500, DMR-1055522, DMR-0808842, DMR-0529399, NSF PHY05-51164]
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Among the broad spectrum of systems predicted to exhibit topological superconductivity and Majorana fermions, one-dimensional wires with strong spin-orbit coupling provide one of the most promising experimental candidates. Here we investigate the fate of the topological superconducting phase in such wires when repulsive interactions are present. Using a combination of density matrix renormalization group, bosonization, and Hartree-Fock techniques, we demonstrate that while interactions degrade the bulk gap-consistent with recent results of Gangadharaiah et al.-they also greatly expand the parameter range over which the topological phase arises. In particular, we show that with interactions this phase can be accessed over a broader chemical potential window, thereby leading to greater immunity against disorder-induced chemical potential fluctuations in the wire. We also suggest that in certain wires strong interactions may allow Majorana fermions to be generated without requiring a magnetic field.
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