Superconducting quantum fluctuations in one dimension

Андрей Георгиевич Семенов, Andrei D. Zaikin

Dai S. Hirashima, Masafumi Katano, Katsunori Kubo +5 more

Sandro Sorella, George Balster Martins, Federico Becca +4 more

Using computational techniques, it is shown that pairing is a robust property of hole-doped antiferromagnetic insulators. In one dimension and for two-leg ladder systems, a BCS-like variational wave function with long-bond spin singlets and a Jastrow factor provides an accurate representation of the ground state of the t-J model, even though strong quantum fluctuations destroy the off-diagonal superconducting long-range order in this case. However, in two dimensions it is argued-and numerically confirmed using several techniques, especially quantum Monte Carlo-that quantum fluctuations are not strong enough to suppress superconductivity.

김범준

M. I. Salkola, Alexander V. Balatsky

A renormalization-group and bosonization approach for a multiband Hamiltonian in one dimension is described. Based on the limit of many bands, it is argued that this Hamiltonian with bare repulsive electron-electron interactions is scaled under specific conditions to a model in which superconducting ordering fluctuations dominate.

Subir Sachdev A, Oleg A. Starykh