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Condensed Matter Theory Laboratory
Akira FURUSAKI
Chief Scientist
Akira FURUSAKI (D.Sci.)
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Research Areas

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.

Research Subject

  1. Strongly-correlated electron systems
  2. Quantum phase transitions
  3. Mesoscopic systems

Related links

  1. RIKEN Advanced Science Institute Website_Laboratories PageNew Window
  2. Individual Website Laboratory PageNew Window

Press release

August 8, 2012
Higgs transition of north and south poles of electrons in a magnet
A potential route to a dissipationless monopole current of spins for spintronics
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.

RIKEN RESEARCH

Septemberr 30, 2011
Unaffected by imperfections
Current flowing along the edges of a promising quantum device is insensitive to its magnetic impurities New Window
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 New Window
March 04, 2011
Predicting a chain of order
Theoretical physicists are working to unlock the secrets of a new class of matter known as topological insulators and topological superconductors. New Window
January 14,2011
Particles that are their own worst enemies
A newly proposed superconducting device could lead to the first observation of particles that are their own antiparticles New Window
December 17, 2010
Opening the door to new forms of matter at the Condensed Matter Theory Laboratory
Theoretical physicists are working to unlock the secrets of a new class of matter known as topological insulators and topological superconductors. New Window
September 17,2010
Finding hope in a meltdown
Theoretical physicists find evidence of a new state of matter in a simple oxide New Window
April 17,2009
Spin lattices enter a new phase
A new ordered phase is predicted for geometrically frustrated spin systems even in the absence of magnetic order New Window
March 05,2009
A tale of two excitations
A new theory predicts an unusual excitation spectrum for a chain of ultracold gas atoms New Window

List of Selected Publications

  1. Momoi, T., Sindzingre, P., Kubo, K.:
    "Spin nematic order in multiple-spin exchange models on the triangular lattice"
    Phys. Rev. Lett., 108, 057206 (2012).
  2. Tanaka, Y., Furusaki, A., Matveev, K.A.:
    "Conductance of a helical edge liquid coupled to a magnetic impurity"
    Phys. Rev. Lett., 106, 236402 (2011).
  3. 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).
  4. Onoda, S., Tanaka, Y.:
    "Quantum melting of spin ice: emergent cooperative quadrupole and chirality"
    Phys. Rev. Lett., 105, 047201 (2010).
  5. 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).
  6. 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).
  7. Matveev, K.A., Furusaki, A., Glazman, L.I.:
    "Bosonization of strongly interacting one-dimensional electrons"
    Phys. Rev. B, 76, 155440 (2007).
  8. 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).
  9. 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).
  10. Shannon, N., Momoi, T., Sindzingre, P.:
    "Nematic order in square lattice frustrated ferromagnets"
    Phys. Rev. Lett., 96, 027213 (2006).

Members

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