Nonequilibrium dynamics of multiorbital correlated electron system under time-depending electric field

Onishi, Hiroaki

Physica Status Solidi (B), 250(3), p.553 - 556, 2013/03

https://doi.org/10.1002/pssb.201200792

Quantum critical magnetization behaviors of kagome- and triangular-lattice antiferromagnets

Sakai, Toru; Nakano, Hiroki*

Physica Status Solidi (B), 250(3), p.579 - 582, 2013/01

https://doi.org/10.1002/pssb.201200763

The magnetization processes of the kagome- and triangular-lattice antiferromagnets are investigated by the numerical diagonalization and the finite-size scaling analysis. Particularly, we focus on anomalous quantum critical phenomena around 1/3 of the saturation magnetization. Our previous work suggested that the kagome-lattice antiferromagnet exhibits a new field induced phase transition called a magnetization ramp, while the triangular-lattice one has a conventional magnetization plateau. In this work, we consider an extended lattice model including both of the kagome- and triangular-lattice systems and investigate a quantum phase transition between the magnetization ramp and plateau.