Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators

Herbrych, J.; Środa, M.; Alvarez, G.; Mierzejewski, M.; Dagotto, E.

doi:10.1038/s41467-021-23261-2

Title: Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators

Journal Article · Wed May 19 00:00:00 EDT 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-23261-2· OSTI ID:1785167

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^[1]; Alvarez, G. ^[2]; Mierzejewski, M. ^[1];

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Wroclaw Univ. of Science and Technology (Poland)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Topological phases of matter are among the most intriguing research directions in Condensed Matter Physics. It is known that superconductivity induced on a topological insulator’s surface can lead to exotic Majorana modes, the main ingredient of many proposed quantum computation schemes. In this context, the iron-based high critical temperature superconductors are a promising platform to host such an exotic phenomenon in real condensed-matter compounds. The Coulomb interaction is commonly believed to be vital for the magnetic and superconducting properties of these systems. This work bridges these two perspectives and shows that the Coulomb interaction can also drive a canonical superconductor with orbital degrees of freedom into the topological state. Namely, we show that above a critical value of the Hubbard interaction the system simultaneously develops spiral spin order, a highly unusual triplet amplitude in superconductivity, and, remarkably, Majorana fermions at the edges of the system.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); Polish National Agency for Academic Exchange (NAWA)

Grant/Contract Number:: AC05-00OR22725; PPN/PPO/2018/1/00035

OSTI ID:: 1785167

Journal Information:: Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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