ChemInform Abstract: Iron‐Catalyzed C(sp²)—H and C(sp³)—H Arylation by Triazole Assistance.

Abstract

This method utilizes a triazole‐derived auxiliary for the iron‐catalyzed activation of otherwise inert C(sp2)—H and C(sp3)—H bonds.

Competing pairing channels in the doped honeycomb lattice Hubbard model

“…At finite doping, however, the presence of even weak interactions among the electrons is predicted by several studies to lead to new collective behavior. Of particular recent interest are interaction-driven instabilities towards unconventional superconductivity in doped honeycomb systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Some early studies concluded that superconductivity might not be stable with respect to charge or spin order for the basic Hubbard model on the honeycomb lattice [2,3], and a possible quantum liquid state has been suggested recently for the van Hove singularity (VHS) filling [18].…”

“…A possible p + ip pairing state was also reported at low filling from determinantal quantum Monte Carlo studies; however, the sign problem poses restrictions on the accessible system sizes, interaction strengths and temperature ranges. In addition, Grassmann tensor renormalization calculations have been performed [14,15], and in Ref. [14], a d + id state is reported for the t − J model, while for infinite local repulsion a p + ip superconducting state, coexisting with ferromagnetic order, has been proposed for the Hubbard model at low doping [15].…”

“…In addition, Grassmann tensor renormalization calculations have been performed [14,15], and in Ref. [14], a d + id state is reported for the t − J model, while for infinite local repulsion a p + ip superconducting state, coexisting with ferromagnetic order, has been proposed for the Hubbard model at low doping [15]. Hence, despite active pursuits, such deviations among the various proposals and employed methods show that a consistent picture of possible superconductivity even in the basic Hubbard model on the honeycomb lattice is still lacking, apparently due to competition among several possible low-energy states upon varying the doping or interaction strength.…”