30 citations · 88 across the 5 of their papers we have counts for
5 papers
Frustrated spin ladder with alternating spin-1 and spin-1/2 rungs
V. Ravi Chandra, N. B. Ivanov, J. Richter
We study the impact of the diagonal frustrating couplings on the quantum phase diagram of a two-leg ladder composed of alternating spin-1 and spin-1/2 rungs. As the coupling streng…
Magnetic phase diagram of a frustrated ferrimagnetic ladder: Relation to the one-dimensional boson Hubbard model
N. B. Ivanov, J. Richter
We study the magnetic phase diagram of two coupled mixed-spin Heisenberg chains as a function of the frustration parameter related to diagonal exchange couplings. The a…
Collective excitations in ferrimagnetic Heisenberg ladders
N. B. Ivanov, J. Richter
We study ground-state properties and the low-lying excitations of Heisenberg spin ladders composed of two ferrimagnetic chains with alternating site spins by using the…
Frustrated quantum Heisenberg ferrimagnetic chains
N. B. Ivanov, J. Richter, U. Schollwoeck
We study the ground-state properties of weakly frustrated Heisenberg ferrimagnetic chains with nearest and next-nearest neighbor antiferromagnetic exchange interactions and two typ…
Square-lattice Heisenberg antiferromagnet with two kinds of nearest-neighbor regular bonds
N. B. Ivanov, S. E. Krüger, J. Richter
We study the zero-temperature phase diagram of a square-lattice Heisenberg antiferromagnet with two types of regularly distributed nearest-neighbor exchange constants, $J_1…