2025/10/21 by S. A. Sherif, Prakash Chand Sharma, Sherif, Sogoud +5
Physics and Astronomy · Materials Science · #Physics of Superconductivity and Magnetism #Iron-based superconductors research #Advanced Condensed Matter Physics
paper · pdf · doi:10.48550/arxiv.2510.18954
The fermionic Hubbard model, when combined with the ingredient of frustration, associated with the breaking of particle-hole symmetry, harbors a rich phase diagram. Aspects of theoretical findings associated with the nature of magnetism and metallicity, in a diverse set of parameter regimes, are now being actively investigated in triangular Hubbard cold atom and solid-state (moiré) based emulators. Building on the theoretical work of Haerter and Shastry [Phys. Rev. Lett. 95,087202 (2005)], we explore the impact of kinetically frustrated magnetism, a phenomenon where antiferromagnetic order emerges without any underlying magnetic interactions, at finite hole density. We numerically study the infinite-U triangular Hubbard model using the density matrix renormalization group algorithm and estimate the extent of stability of the kinetically induced 120∘ antiferromagnetic state to hole doping. Beyond the Haerter-Shastry regime, we find an intermediate phase with multimer (involving multiple correlated spins) stripes that eventually gives way to a paramagnet. We also find evidence of gapless charge excitations (metallicity) throughout the phase diagram for finite hole density. We discuss the implications at large, but finite and realistic values of U/t, and investigate whether kinetic magnetism and superexchange collaborate or compete.