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-electron 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.
- Septemberr 30, 2011
- Unaffected by imperfections
Current flowing along the edges of a promising quantum device is insensitive to its magnetic impurities![]()
- Septemberr 09, 2011
- Pushing the frontier of state control
The ability to use magnetic fields to control a newly identified state of matter could enable more efficient memory devices![]()
- Momoi, T., Sindzingre, P., Kubo, K.:
"Spin nematic order in multiple-spin exchange models on the triangular lattice"
Phys. Rev. Lett., 108, 057206 (2012). - Tanaka, Y., Furusaki, A., Matveev, K.A.:
"Conductance of a helical edge liquid coupled to a magnetic impurity"
Phys. Rev. Lett., 106, 236402 (2011). - 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). - Shannon, N., Momoi, T., Sindzingre, P.:
"Nematic order in square lattice frustrated ferromagnets"
Phys. Rev. Lett., 96, 027213 (2006).
Principal Investigator
- Akira FURUSAKI
- Chief Scientist
Staff Scientist
- Tsutomu MOMOI
- Senior Research Scientist
- Shigeki ONODA
- Senior Research Scientist
- Hitoshi SEO
- Senior Research Scientist
Postdoctoral Fellow
- Daisuke YAMAMOTO
- Special Postdoctoral Researcher
- Hiroshi UEDA
- Special Postdoctoral Researcher
- Yasumasa TSUTSUMI
- Special Postdoctoral Researcher
- Takahiro MORIMOTO
- Special Postdoctoral Researcher
- Giacomo MARMORINI
- Foreign Postdoctoral Researcher
Visiting Research Staff
- Takeo IZUYAMA
- Visiting Scientist