Emergence of superconductivity in doped multiorbital Hubbard chains

Patel, Niravkumar D.; Kaushal, Nitin; Nocera, Alberto; Alvarez, Gonzalo; Dagotto, Elbio

doi:10.1038/s41535-020-0228-2

Title: Emergence of superconductivity in doped multiorbital Hubbard chains

Journal Article · Fri May 08 00:00:00 EDT 2020 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-020-0228-2· OSTI ID:1765428

Patel, Niravkumar D.; Kaushal, Nitin; Nocera, Alberto; Alvarez, Gonzalo;

Abstract We introduce a variational state for one-dimensional two-orbital Hubbard models that intuitively explains the recent computational discovery of pairing in these systems when hole doped. Our ansatz is an optimized linear superposition of Affleck–Kennedy–Lieb–Tasaki valence-bond states, rendering the combination a valence-bond liquid dubbed orbital resonant valence bond. We show that the undoped (one-electron/orbital) quantum state of two sites coupled into a global spin singlet is exactly written employing only spin-1/2 singlets linking orbitals at nearest-neighbor sites. Generalizing to longer chains defines our variational state visualized geometrically expressing our chain as a two-leg ladder, with one orbital per leg. As in Anderson’s resonating valence-bond state, our undoped variational state contains preformed singlet pairs that via doping become mobile, leading to superconductivity. Doped real materials with one-dimensional substructures, two near-degenerate orbitals, and intermediate Hubbard U / W strengths— W the carrier’s bandwidth—could realize spin-singlet pairing if on-site anisotropies are small. If these anisotropies are robust, spin-triplet pairing emerges.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1765428

Alternate ID(s):: OSTI ID: 1619011

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Vol. 5 Journal Issue: 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 12 works

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