Research Interests

I have been studying the physis of mesoscopic systems such as carbon nanotubes, quantum dots, nano-mechanics.

Main studies

Carbon nanotubes:

     Tomonaga-Luttinger liquid:

New J. Phys. 7, 244 (2005). (Tomonaga-Luttinger liquid and NEMS)

     Curvature-induced effects:

J. Phys. Soc. Jpn. 78, 074707 (2009). (Spin-orbit interaction)
Phys. Rev. B 85, 165430 (2012). (Linear band tilting and vernier spectrum)

     Finite-length effects (Mesoscopic effects):

Phys. Rev. B 91, 235442 (2015). (Valley coupling in finite-length carbon nanotubes)
Phys. Rev. B 93, 195442 (2016). (Angular momentum and valley coupling, Bulk-edge correspondence for edge states. Link to Brief summary.)

Quantum dot:

     Kondo effect:

J. Phys. Soc. Jpn. 74, 103, (2005). (Kondo effect: Review of our research with NRG)

     Spin blockade:

Phys. Rev. Lett. 110, 016803, (2013), Phys. Rev. B, 89, 085302 (2014).
(Amaha, Izumida, et al. Observation of Triple-Quantum-Dot [PRL(2013)] and Quadruplet Spin Blockade in Double-quantum-dot [PRB (2014)]. Explaining the observations by theory with Master Eq. method.)


Phys. Rev. B 85, 075313 (2012). (Theoretical study on mechanical vibration of rolling NEMS)
Phys. Rev. B, 89, 245304 (2014). (Okamoto, Izumida, Friedland, et al. Observation of mechanical vibration of a cylindrical semiconductor. Explaining the observations by theory.)


2014/03/29: 19th JPS Award for Outstanding Papers (for the following paper)
       J. Phys. Soc. Jpn. 78, 074707 (2009)
2015/10/31: 11th Morita-Kinen Prize (from Alumni Association, Tohoku University Department of Physics, for the following three papers)
       J. Phys. Soc. Jpn. 78, 074707 (2009)
       Phys. Rev. B 85, 165430 (2012)
       Phys. Rev. B 91, 235442 (2015)



Reprint requirement

If you need reprints of our paper, please contact me by e-mail (, "_at_" ==> "@" ). I will send pdf files.