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cond-mat1998★ 25 cited
Two-level Hamiltonian of a superconducting quantum point contact
D. A. Ivanov, M. V. Feigel'man
In a superconducting quantum point contact, dynamics of the superconducting phase is coupled to the transitions between the subgap states. We compute this coupling and derive the t…
cond-mat1998★ 11 cited
Staggered-spin contribution to nuclear spin-lattice relaxation in two-leg antiferromagnetic spin-1/2 ladders
D. A. Ivanov, Patrick A. Lee
We study the nuclear spin-lattice relaxation rate in the two-leg antiferromagnetic spin-1/2 Heisenberg ladder. More specifically, we consider the contribution to fr…
cond-mat1997★ 9 cited
Bipolaronic charge excitations in t-J two-leg ladders
Dmitri A. Ivanov, Patrick A. Lee
We present a low-energy effective model for the charge degrees of freedom in two-leg t-J ladders. Starting from SU(2) mean-field theory, we exclude the spin degrees of freedom whic…