17 citations · 23 across the 4 of their papers we have counts for
6 papers
Entanglement-based tensor-network strong-disorder renormalization group
Kouichi Seki, Toshiya Hikihara, Kouichi Okunishi
We propose an entanglement-based algorithm of the tensor-network strong-disorder renormalization group (tSDRG) method for quantum spin systems with quenched randomness. In contrast…
Tensor-network strong-disorder renormalization groups for random quantum spin systems in two dimensions
Kouichi Seki, Toshiya Hikihara, Kouichi Okunishi
Novel randomness-induced disordered ground states in two-dimensional (2D) quantum spin systems have been attracting much interest. For quantitative analysis of such random quantum…
Lattice Unruh effect and world-line entanglement for the XXZ chain
Kouichi Okunishi, Kouichi Seki
For the XXZ chain, we discuss the relation between a lattice version of Unruh effect and the ground-state entanglement on the basis of the corner Hamiltonian. We find that the latt…
Phase Transitions for Cuboc Orders in Stacked Kagome Heisenberg Systems
Kouichi Seki, Kouichi Okunishi
Using the event-chain Monte Carlo (MC) algorithm, we investigate phase transitions of the stacked Kagome Heisenberg systems with classical vector spins including up to the 3rd-near…
Spin-wave analysis for Kagome-triangular spin system and coupled spin tubes: low-energy excitation for the cuboc order
Masahiro Ochiai, Kouichi Seki, Kouichi Okunishi
The coupled spin tube system, which is equivalent to a stacked Kagome-triangular spin system, exhibits the cuboc order -- a non-coplanar spin order with a twelve-sublattice structu…
Magnetic phase diagram of the coupled triangular spin tubes for CsCrF4
Kouichi Seki, Kouichi Okunishi
Using Monte Carlo simulations, we explore the magnetic phase diagram of the triangular spin tubes coupled with a ferromagnetic inter-tube interaction for CsCrF4. A planar structure…