Tuning Topological Orders by a Conical Magnetic Field in the Kitaev Model.
Phys Rev Lett
; 125(17): 177203, 2020 Oct 23.
Article
em En
| MEDLINE
| ID: mdl-33156649
ABSTRACT
We show that a conical magnetic field H=(1,1,1)H can be used to tune the topological order and hence, anyon excitations of the Z_{2} quantum spin liquid in the isotropic antiferromagnetic Kitaev model. A novel topological order, featured with Chern number C=4 and Abelian anyon excitations, is induced in a narrow range of intermediate fields H_{c1}≤H≤H_{c2}. On the other hand, the C=1 Ising-topological order with non-Abelian anyon excitations, as previously known to be present at small fields, is found here to survive up to H_{c1}. The results are obtained by developing and applying a Z_{2} mean field theory that works at finite fields and is asymptotically exact in the zero field limit and the associated variational quantum Monte Carlo.
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MEDLINE
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En
Ano de publicação:
2020
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Article