Publications (47)
Spin-Orbital Fluctuations and a large mass enhancement in LiV_2O_4
Yasufumi Yamashita, Kazuo Ueda
We present a scenario that the multi-component fluctuations, especially those of the spin-orbital coupled modes, lead to the mass enhancement observed in LiV_2O_4. This phenomena i…
Time-dependent DMRG Study on Quantum Dot under a Finite Bias Voltage
Shunsuke Kirino, Tatsuya Fujii, Jize Zhao +1
Resonant tunneling through quantum dot under a finite bias voltage at zero temperature is investigated by using the adaptive time-dependent density matrix renormalization group(TdD…
NMR relaxation and resistivity from rattling phonons in pyrochlore superconductors
Thomas Dahm, Kazuo Ueda
We calculate the temperature dependence of NMR relaxation rate and electrical resistivity for coupling to a local, strongly anharmonic phonon mode. We argue that the two-phonon Ram…
Continuous Mott Transition in a Two-Dimensional Hubbard Model
Yuki Yanagi, Kazuo Ueda
We investigate nonmagnetic metal-insulator transition in the 1/5-depleted square lattice Hubbard model at half-filling within the 8-site cellular dynamical mean field theory. We fi…
New valence bond crystal phase of a frustrated spin-1/2 square lattice antiferromagnet
M. E. Zhitomirsky, Kazuo Ueda
We propose a new type of magnetically disordered ground state for a frustrated quantum antiferromagnet. This disordered state is an array of spin singlets spontaneously formed on f…
SU(4) spin-orbit critical state in one dimension
Yasufumi Yamashita, Naokazu Shibata, Kazuo Ueda
Effect of quantum fluctuations concerned with the orbital degrees of freedom is discussed for the model with SU(4) symmetry in one dimension. An effective Hamiltonian is derived fr…