-
Article
Open AccessQuasi-fractionalization of edge spin in chirality-assisted cluster-based Haldane state on triangular spin tube
Fractionalization of quantum degrees of freedom holds the key to finding new phenomena in physics, e.g., the quark model in hadron physics and the spin-charge separation in strongly-correlated electron systems...
-
Article
Open AccessUnveiling phase diagram of the lightly doped high-Tc cuprate superconductors with disorder removed
The currently established electronic phase diagram of cuprates is based on a study of single- and double-layered compounds. These CuO2 planes, however, are directly contacted with dopant layers, thus inevitably d...
-
Article
Open AccessExciton-assisted low-energy magnetic excitations in a photoexcited Mott insulator on a square lattice
The photoexcitation of a Mott insulator on a square lattice weakens the intensity of both single- and two-magnon excitations as observed in time-resolved resonant-inelastic X-ray scattering and time-resolved R...
-
Article
Optical detection of quantum geometric tensor in intrinsic semiconductors
Quantum geometric tensor, including a symmetric real part defined as quantum metric and an antisymmetric part defined as Berry curvature, is essential for understanding many phenomena. In this study, we invest...
-
Article
Open AccessResonating dimer–monomer liquid state in a magnetization plateau of a spin- \(\frac{1}{2}\) kagome-strip Heisenberg chain
Highly frustrated spin systems such as the kagome lattice are a treasure trove of new quantum states with large entanglements. Herein, we study the spin- ...
-
Article
Open AccessGapless spin liquid in a square-kagome lattice antiferromagnet
Observation of a quantum spin liquid (QSL) state is one of the most important goals in condensed-matter physics, as well as the development of new spintronic devices that support next-generation industries. Th...
-
Article
Open AccessPossible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4
K3Cu3AlO2(SO4)4 is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in the inelastic neutron scattering spectra, whic...
-
Article
Optical conductivity of antiferromagnetic metallic chromium: Mean-field calculation for the multi-orbital Hubbard model
The discovery of iron-pnictide superconductors has enhanced the attraction of the antiferromagnetic metallic phase of multi-orbital systems. We focus on Cr, which is representative antiferromagnetic metal with...
-
Article
Effect of Electron Correlation on Phonon Spectra in Cuprates
We examine theoretically the phonon dynamics in the electron-phonon-coupled systems. The model Hamiltonian is a one-dimensional Hubbard model where the hop** of electrons induces the electron-phonon coupling...
-
Chapter and Conference Paper
Magnetic Interaction in 1D, 2D and Ladder Cuprates
In this paper, the magnetic interactions for one-dimensional (1D), two-dimensional (2D) and ladder cuprates are systematically examined. By a comparison of eigenstates between Cu-O clusters and the correspondi...
-
Chapter and Conference Paper
Resonant Inelastic X-Ray Scattering in Insulating Cuprates: A Numerical Study of the Hubbard Model
The momentum dependence of the RIXS spectrum in insulating cuprates is examined theoretically. Cu K-edge RIXS spectrum is calculated by using the exact diagonalization technique on small clusters in the Hubbard m...
-
Chapter and Conference Paper
Charge Stripes and Electronic States in Underdoped La2-x Sr x CuO4
We investigate the electronic states of underdoped La2-x Sr x CuO4 (LSCO) by the t-tʼ-t”- J V model containing charge stripes. The numerically exa...
-
Chapter and Conference Paper
Evolution of Spectral Function from Insulator to Superconductor: What do We Learn from Angle-Resolved Photoemission?
The angle-resolved photoemission spectroscopy provides unique information for the dramatic change of high-Tc cuprates from insulator to superconductor upon carrier-do**. To extract the underlying physics, we in...
-
Article
Magnetic Interaction in Insulating Cuprates
We examine two-spin (2S) and cyclic four-spin (4S) magnetic interactions in insulating ladder and two-dimensional (2D) cuprates. By a comparison of eigenstates between d-p and Heisenberg models, ...
-
Article
Role of Stripes in Spin and Charge Dynamics of Underdoped La2−x Sr x CuO4
We investigate the electronic states of underdoped La 2−x Sr x CuO 4 (LSCO) by using a microscopic...
-
Article
Anomalous spectral function of the 1D and 2Dt-J models
The spectral function of the one-dimensional (1D) and two-dimensional (2D)t-J models is examined in connection with spin and charge dynamics by using the exact diagonalization technique. Near half filling, the sp...
