Ferromagnetism and d+id superconductivity in 1/2 doped correlated systems on triangular lattice

TL;DR

This study explores the phase diagram of a doped triangular lattice system, revealing a first order transition from ferromagnetism to d+id superconductivity at a specific ratio of exchange to hopping parameters.

Contribution

It provides a comprehensive analysis combining numerical and theoretical methods to identify phase transitions in a doped correlated system on a triangular lattice.

Findings

First order transition from ferromagnetism to d+id superconductivity

Transition occurs at J/t=0.4±0.2

Ground state symmetry quantum numbers confirm phase distinctions

Abstract

We investigate the quantum phase diagram of t-J model on triangular lattice at 1/2 doping with various lattice sizes by using a combination of density matrix renormalization group (DMRG), variational Monte Carlo and quantum field theories. To sharply distinguish different phases, we calculated the symmetry quantum numbers of the ground state wave functions, and the results are further confirmed by studying correlation functions. Our results show there is a first order phase transition from ferromagnetism to d+id superconductivity, with the transition taking place at $J/t=0.4\pm0.2$.