Condensed Matter Theory Laboratory
Chief Scientist
Akira FURUSAKI (D.Sci.)
We aim to understand theoretically various properties of materials of macroscopic scale from the physical laws that govern microscopic world. Many-particle systems having infinite degrees of freedom exhibit rich physical phenomena: they can have phases with spontaneously broken symmetry and transitions among these phases. A typical example is offered by magnetism and superconductivity in strongly-correlated electron systems, such as transition metal oxides and molecular conductors, which are the main research subjects of our laboratory. Our recent research subjects include unconventional ordered states and spin liquids in strongly frustrated quantum magnets and other new kinds of quantum phases like topological insulators and topological superconductors. Furthermore, we study quantum phenomena in mesoscopic systems of nanometer scale and statistical physics of random systems.
- Strongly-correlated electron systems
- Quantum phase transitions
- Mesoscopic systems
- March 29, 2007
- Condensed Matter Theory Laboratory of DRI provided evidence for the existence of conformal invariance in irregular electronic systems (the metal insulator phase change point, for example) and elucidated its relation to multifractal systems by performing large-scale numerical calculations.
- Neupert, T., Onoda, S., Furusaki, A.:
"A chain of Majorana fermions along a magnetic domain wall: an s-wave Dirac-fermion superconducting interface with an insulating ferromagnet" Phys. Rev. Lett., 105, 206404 (2010). - Yoshioka, H., Tsuchiizu, M., Otsuka, Y., Seo, H.:
"Finite-temperature properties across the charge ordering transition -- combined bosonization, renormalization group, and numerical methods"
J. Phys. Soc. Jpn., 79, 094714 (2010). - Onoda, S., Tanaka, Y.:
"Quantum melting of spin ice: emergent cooperative quadrupole and chirality"
Phys. Rev. Lett., 105, 047201 (2010). - Schnyder, A.P., Ryu, S., Furusaki, A., Ludwig, A.W.W.:
"Classification of topological insulators and superconductors in three spatial dimensions"
Phys. Rev. B, 78, 195125 (2008). - Hikihara, T., Kecke, L., Momoi, T., Furusaki, A.:
"Vector chiral and multipolar orders in the spin-1/2 frustrated ferromagnetic chain in magnetic field"
Phys. Rev. B, 78, 144404 (2008). - Matveev, K.A., Furusaki, A., Glazman, L.I.:
"Bosonization of strongly interacting one-dimensional electrons"
Phys. Rev. B, 76, 155440 (2007). - Ryu, S., Mudry, C., Obuse, H., Furusaki, A.:
"Z2 topological term, the global anomaly, and the two-dimensional symplectic symmetry class of Anderson localization"
Phys. Rev. Lett., 99, 116601 (2007). - Obuse, H., Subramaniam, A.R., Furusaki, A., Gruzberg, I.A., Ludwig, A.W.W.:
"Multifractality and conformal invariance at 2D metal-insulator transition in the spin-orbit symmetry class"
Phys. Rev. Lett., 98, 156802 (2007). - Momoi, T., Sindzingre, P., Shannon, N.:
"Octupolar order in the multiple spin exchange model on a triangular lattice"
Phys. Rev. Lett., 97, 257204 (2006). - Shannon, N., Momoi, T., Sindzingre, P.:
"Nematic order in square lattice frustrated ferromagnets"
Phys. Rev. Lett., 96, 027213 (2006).