Narrowing of topological bands due to electronic orbital degrees of freedom |
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Authors: | Venderbos Jörn W F Daghofer Maria van den Brink Jeroen |
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Institution: | Institute for Theoretical Solid State Physics, IFW Dresden, 01171 Dresden, Germany. |
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Abstract: | The fractional quantum Hall effect has been predicted to occur in the absence of magnetic fields and at high temperature in lattice systems that have flat bands with a nonzero Chern number. We demonstrate that orbital degrees of freedom in frustrated lattice systems lead to a narrowing of topologically nontrivial bands. This robust effect does not rely on fine-tuned long-range hopping parameters and is directly relevant to a wide class of transition-metal compounds. |
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