High-temperature fractional quantum Hall states.

By Evelyn Tang, J. Mei, X. Wen. Physical Review Letters, 2010

794 citations recorded by the source corpus.

We show that a suitable combination of geometric frustration, ferromagnetism, and spin-orbit interactions can give rise to nearly flatbands with a large band gap and nonzero Chern number. Partial filling of the flatband can give rise to fractional quantum Hall states at high temperatures (maybe even room temperature). While the identification of material candidates with suitable parameters remains open, our work indicates intriguing directions for exploration and synthesis.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/e5db80b49e8dcae932f8b5e77f4ab3041a3a9b1d

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In Atomic and Molecular Physics, and Optics

1. A. Bostwick
2. Eli Rotenberg
3. Junwei Liu
4. Rahul Roy
5. Liang Fu
6. Shiv Sondhi
7. Mazhar N. Ali
8. S. Parameswaran

Citations in the corpus

• Quantum states and intertwining phases in kagome materials (2023, background): “Based on these effects, the flat band, and tuning its filling in the kagome lattice, can generate many non-trivial topological states 50,86–89 , as well as symmetry-breaking quantum states, including charge or spin orders, nematic phases 51,53,54 , ferromagnetism with spin-polarized bands 56,57,90…”
• Fractional quantum Hall physics in topological flat bands (2013, positive): “The recent flurry of interest in the FQHE in topological flat bands began with the work of three groups [13,14,15]; several authors have since constructed models with nearly flat (non-dispersing) Chern bands which allow interactions to dominate at partial fillings while leaving the gap to neighborin”
• Massive Dirac fermions in a ferromagnetic kagome metal (2017, background): “This offers insight into recent discoveries of exotic electronic behavior in kagome lattice antiferromagnets [11–13] and may provide a stepping stone toward lattice model realizations of fractional topological quantum states [14, 15].”
• Flat bands, strange metals and the Kondo effect (2023, neutral): “For multi-orbital systems such as the iron pnictides or chalcogenides, the Mott transition can become orbitally selective, allowing metallic behaviour to survive at the largest values of U / W .”