High-temperature surface superconductivity in topological flat-band systems

By N. B. Kopnin, T. Heikkilä, Grigory E. Volovik. 2011

371 citations recorded by the source corpus.

We show that the topologically protected flat band emerging on a surface of a nodal fermionic system promotes the surface superconductivity due to an infinitely large density of states associated with the flat band. The critical temperature depends linearly on the pairing interaction and can be thus considerably higher than the exponentially small bulk critical temperature. We discuss an example of surface superconductivity in multilayered graphene with rhombohedral stacking.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9e18779dab19f4e4cdc467e37662339c057620e1

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Bogdan Andrei Bernevig
2. P. Törmä
3. Evelyn Tang
4. S. Peotta
5. Liang Fu
6. Stefano Curtarolo
7. Ari Harju
8. Ashvin Vishwanath

In Materials Chemistry

1. Bogdan Andrei Bernevig
2. Evelyn Tang
3. Corey Oses
4. Liang Fu
5. Stefano Curtarolo
6. P. Törmä
7. A. Kusne
8. S. Peotta

Citations in the corpus

• Superfluidity in topologically nontrivial flat bands (2015, background): “(1) The supercurrent wavevector q is introduced in the Hamiltonian in a way that is rigorous for topologically nontrivial bands: a multiband approach is used.”
• Superconductivity, superfluidity and quantum geometry in twisted multilayer systems (2021, background): “Would stacking more layers eventually lead to room temperature superconductivity, in the spirit of the early proposal [2]? Certainly, materials which have been thought to be non-superconducting in the past – such as untwisted graphene, become superconducting when three layers are stacked together [1”
• Machine learning modeling of superconducting critical temperature (2017, background): “The associated large peak in the density of states (infinitely large in the limit of truly flat bands) can lead to strong electronic instability, and has been discussed recently as one possible way to high-temperature superconductivity.(33,34)”
• Topological states in engineered atomic lattices (2016, background): “The presence of flat bands could also enhance the properties of superconducting materials by increasing the critical temperature [24, 25].”
• Strain-induced partially flat band, helical snake states and interface superconductivity in topological crystalline insulators (2014, background): “As shown recently, the superconducting transition temperature Tc in a flat-band system is linearly proportional to the area of the flat band in momentum space[35], which is parametrically enhanced compared to BCS theory.”