We review the interplay of frustration and strong electronic correlations in quasi-two-
dimensional organic charge transfer salts, such as (BEDT-TTF) 2 X and Et n Me 4− n Pn [Pd …

Electron correlation and spin frustration are among the central issues in condensed matter
physics, and their interplay is expected to bring about exotic phases with both charge and …

Motivated by experimental studies that have found signatures of a quantum spin liquid
phase in organic crystals whose structure is well described by the two-dimensional …

We investigate the spin-1 2 Heisenberg model on the triangular lattice in the presence of
nearest-neighbor J 1 and next-nearest-neighbor J 2 antiferromagnetic couplings. Motivated …

In two-dimensional triangular lattices, geometric frustration prohibits the formation of
ordering even at the lowest temperatures, and therefore a liquid-like ground state is …

We have studied the Heisenberg model on the triangular lattice using quantum Monte Carlo
techniques (up to 144 sites) and exact diagonalization (up to 36 sites). By studying the spin …

Topological phases in frustrated quantum spin systems have fascinated researchers for
decades. One of the earliest proposals for such a phase was the chiral spin liquid, a bosonic …

Exact spectra of periodic samples are computed up to N= 36. Evidence of an extensive set of
low-lying levels, lower than the softest magnons, is exhibited. These low-lying quantum …

At strong repulsion, the triangular-lattice Hubbard model is described by s= 1/2 spins with
nearest-neighbor antiferromagnetic Heisenberg interactions and exhibits conventional 120° …

Possible Néel orderings of antiferromagnetically coupled spins on a kagomé lattice are
studied using linear-spin-wave theory and high-temperature expansions. Spin-wave …