Ph. D. Thesis:
“Theory of Bose-Einstein Condensates in Optical Lattices”
Waseda University, March 15, 2005.
Supervisor: Prof. Allan Griffin (University of Toronto) and Prof. Susumu Kurihara (Waseda University).
Waseda University, March 15, 2005.
Supervisor: Prof. Allan Griffin (University of Toronto) and Prof. Susumu Kurihara (Waseda University).
Preprints:
S. Tsuchiya, D. Yamamoto, Y. Ryosuke, and M. Nitta, “Hidden Charge-Conjugation, Parity, Time-Reversal Symmetries and Higgs Modes in Superconductors", arXiv:1804.05577
Publications in refereed journals:
- I. Danshita and S. Tsuchiya, “Localized Higgs modes of superfluid Bose gases in optical lattices: A Gutzwiller mean-field study”, Phys. Rev. A 96, 043606 (2017).
- S. Tsuchiya, J. Goryo, E. Arahata, and M. Sigrist, “Cooperon condensation and intra-valley pairing states in honeycomb Dirac systems”, Phys. Rev. B 94, 104508 (2016).
- R. Yoshii, S. Takada, S. Tsuchiya, G. Marmorini, H. Hayakawa, and M. Nitta, "Fulde-Ferrell-Larkin-Ovchinnikov states in a superconducting ring with magnetic fields: Phase diagram and the first-order phase transitions", Phys. Rev. B 92, 224512 (2015).
- T. Nakayama, I. Danshita, T. Nikuni, and S. Tsuchiya, "Fano resonance through Higgs bound states in tunneling of Nambu-Goldstone modes", Phys. Rev. A 92, 043610 (2015).
- R. Watanabe, S. Tsuchiya, and Y. Ohashi, “Low-dimensional pairing fluctuations and pseudogapped photoemission spectrum in a trapped two-dimensional Fermi gas”, Phys. Rev. A 88, 013637 (2013).
- S. Tsuchiya, R. Ganesh, and T. Nikuni, “Higgs mode in a superfluid of Dirac fermions”, Phys. Rev. B 88, 014527 (2013).
- D. Yamamoto, C. Sato, T. Nikuni, and S. Tsuchiya, “Flow-Induced Charge Modulations in Superfluid Atomic Fermions Loaded into an Optical Kagome Lattice”, Phys. Rev. Lett. 110, 145304 (2013).
- R. Watanabe, S. Tsuchiya, and Y. Ohashi, “Coexistence of superfluid gap and pseudogap in the BCS-BEC crossover regime of a trapped Fermi gas below Tc”, Phys. Rev. A 86, 063603 (2012).
- D. A. Takahashi, S. Tsuchiya, R. Yoshii, and M. Nitta, “Fermionic solutions of chiral Gross-Neveu and Bogoliubov-de Gennes systems in nonlinear Schrodinger hierarchy”, Phys. Lett. B, 718 (2), pp.632-637 (2012).
- S. Tsuchiya, R. Ganesh, and A. Paramekanti, “Superfluidity of Dirac Fermions in a Tunable Honeycomb Lattice: Cooper Pairing, Collective Modes, and Critical Currents”, Phys. Rev. A 86, 033604 (2012).
- S. Tsuchiya, R. Watanabe, and Y. Ohashi, “Pseudogap temperature and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas”, Phys. Rev. A 84, 043647 (2011).
- T. Kashimura, S. Tsuchiya, and Y. Ohashi, “π-junction and spontaneous current state in a superfluid Fermi gas”, Phys. Rev. A 84, 013609 (2011).
- R. Yoshii, S. Tsuchiya, G. Marmorini, and M. Nitta, “Spin imbalance effect of Larkin-Ovchinikov-Fulde-Ferrel state”, Phys. Rev. B 84, 024503 (2011).
- R. Watanabe, S. Tsuchiya, and Y. Ohashi, “Superfluid density of states and pseudogap phenomenon in the BCS-BEC crossover regime of a superfluid Fermi gas”, Phys. Rev. A 82, 043630 (2010).
- S. Tsuchiya, R. Watanabe, and Y. Ohashi, “Photoemission spectrum and effect of inhomogeneous pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas”, Phys. Rev. A 82, 033629 (2010).
- T. Kashimura, S. Tsuchiya, and Y. Ohashi, “Superfluid-ferromagnet-superfluid junction and πphase in a superfluid Fermi gas”, Phys. Rev. A 82, 033617 (2010).
- Y. Yunomae, D. Yamamoto, I. Danshita, N. Yokoshi, and S. Tsuchiya, “Instability of superfluid Fermi gases induced by a roton-like density mode in optical lattices”, Phys. Rev. A 80, 063627 (2009).
- S. Tsuchiya, R. Watanabe, and Y. Ohashi, “Single-particle properties and pseudogap effects in the BCS-BEC crossover regime of an ultracold Fermi gas above Tc”, Phys. Rev. A 80, 033613 (2009). selected for Kaleidoscope in PRA
- S. Tsuchiya and Y. Ohashi, “Supercurrent induced by tunneling Bogoliubov excitations in a Bose-Einstein condensate”, Phys. Rev. A 79, 063619 (2008).
- Y. Ohashi and S. Tsuchiya, “Supercurrent behavior of low-energy Bogoliubov phonon and anomalous tunneling effect in a Bose-Einstein condensate”, Phys. Rev. A 78, 043601 (2008).
- S. Tsuchiya and Y. Ohashi, “Anomalous enhancement of quasiparticle current near a potential barrier in a Bose-Einstein condensate”, Phys. Rev. A 78, 013628 (2008).
- S. Tsuchiya, F. Dalfovo, and L. Pitaevskii, “Solitons in two-dimensional Bose-Einstein condensates”, Phys. Rev. A 77, 045601 (2008).
- I. Danshita and S. Tsuchiya, “Comment on "Nonlinear band structure in Bose-Einstein condensates: Nonlinear Schrodinger equation with a Kronig-Penney potential"”, Phys. Rev. A 76, 017601 (2007).
- I. Danshita and S. Tsuchiya, “Stability of Bose-Einstein condensates in a Kronig-Penney potential”, Phys. Rev. A 75, 033612 (2007).
- T. Kimura, S. Tsuchiya, M. Yamashita, and S. Kurihara, “Superfluid-Mott Insulator Transition of Spin-1 Bosons in an Optical Lattice under Magnetic Field”, J. Phys. Soc. Jpn. 75, 074601 (2006).
- S. Tsuchiya and A. Griffin, “Landau damping of Bogoliubov excitations in two- and three-dimensional optical lattices at finite temperatures”, Phys. Rev. A 72, 053621 (2005).
- I. Danshita, S. Kurihara, and S. Tsuchiya, “Bogoliubov excitations in a Kronig-Penney potential”, Phys. Rev. A 72, 053611 (2005).
- T. Kimura, S. Tsuchiya, and S. Kurihara, “Possibility of a First-Order Superfluid—Mott-Insulator Transition of Spinor Bosons in an Optical Lattice”, Phys. Rev. Lett. 94, 110403 (2005).
- S. Tsuchiya, S. Kurihara, and T. Kimura, “Superfluid-Mott insulator transition of spin-1 bosons in an optical lattice”, Phys. Rev. A 70, 043628 (2004) 11 pages. arXiv:cond-mat/0209676.
- S. Tsuchiya and A. Griffin, “Damping of Bogoliubov excitations in optical lattices”, Phys. Rev. A 70, 023611 (2004).
- S. Tuchiya and S. Kurihara, “Topological Excitations in Spinor Bose-Einstein condensates”, J. Phys. Soc. Jpn. 70, 1182 (2001).
Conference proceedings (refereed):
- J. Tokimoto, S. Tsuchiya, and T. Nikuni, “Higgs Mode in a Trapped Superfluid Fermi Gas”, Proceedings of the 2016 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 187, pp. 765-770 (2017).
- G. Marmorini, R. Yoshii, S. Tsuchiya, and M. Nitta, “Analytic Self-Consistent Condensates in Quasi-1D Superfluid Fermi Gases in the Andreev Approximation”, Proceedings of the 2013 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 175, pp.420-426 (2014).
- M. Shinozaki, S. Tsuchiya, S. Abe, T. Ozaki, and T. Nikuni, “Elementary excitations of antiferromagnetic spin-1 bosons in an optical lattice”, Proceedings of the 2013 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 175, pp.236-242 (2014).
- R. Watanabe, S. Tsuchiya, and Y. Ohashi, “Two-dimensional pseudogap effects of an ultracold Fermi gas in the BCS-BEC crossover region”, Proceedings of the 2012 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 171, pp.341-347 (2013).
- R. Watanabe, S. Tsuchiya, and Y. Ohashi, “Inhomogeneous Pseudogap Phenomenon in the BCS-BEC Crossover Regime of a Trapped Superfluid Fermi Gas”, Proceedings of 26th International Conference on Low Temperature Physics, J. Phys.: Conf. Ser. 400, 012080 (2012).
- T. Kashimura, S. Tsuchiya, and Y. Ohashi, “π-phase and Spontaneous Supercurrent induced by Pseudo-ferromagnetic Junction in a Spin-polarized Superfluid Fermi Gas”, Proceedings of 26th International Conference on Low Temperature Physics, J. Phys.: Conf. Ser. 400, 012027 (2012).
- R. Watanabe, S. Tsuchiya, and Y. Ohashi, “Theory of Photoemission-type Experiment in the BCS-BEC Crossover Regime of a Superfluid Fermi Gas”, IEEE Xplore (IEEE-ISAS2011 conference proceedings) pp.26-31 (2011). Winning IEEE-ISAS2011 Best Paper Award
- T. Kashimura, S. Tsuchiya, and Y. Ohashi, “Superfluid/ferromagnet/superfluid-junction and π-phase in a superfluid Fermi gas at finite temperatures”, IEEE Xplore (IEEE-ISAS2011 conference proceedings) pp.32-35 (2011). Winning IEEE-ISAS2011 Best Paper Award
- S. Tsuchiya, R. Watanabe, and Y. Ohashi, “Pseudogap behaviors of atomic Fermi gases above Tc in the BCS-BEC crossover”, Proceedings of the 9th International Conference on Materials and Mechanisms of Superconductivity, Physica C 470, pp.S986-S988 (2010).
- R. Watanabe, S. Tsuchiya, and Y. Ohashi, “Pairing fluctuations and pseudogap effects in the BCS-BEC crossover regime of a superfluid Fermi gas”, Proceedings of the 9th International Conference on Materials and Mechanisms of Superconductivity, Physica C 470, pp.S980-S981 (2010).
- S. Tsuchiya, R. Watanabe, and Y. Ohashi, “Pseudogap in fermionic density of states in the BCS-BEC crossover of atomic Fermi gases”, Proceedings of the 2009 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 158, pp.29-35 (2010).
- S. Tsuchiya and Y. Ohashi, “Quasiparticle inducing Josephson effect in a Bose-Einstein condensate”, Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology - ISQM-TOKYO ’08, pp.37-40 (2009).
- Y. Yunomae, I. Danshita, D. Yamamoto, N. Yokoshi, and S. Tsuchiya, “Stability of superfluid Fermi gases in optical lattices”, Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology - ISQM-TOKYO ’08, pp.41-44 (2009).
- S. Tsuchiya and Y. Ohashi, “Enhanced quasiparticle current of Bogoliubov phonons in Bose-Einstein condensates”, Proceedings of the 25th International Conference on Low Temperature Physics, J. Phys.: Conf. Ser. 150, 032113 (2009).
- Y. Yunomae, I. Danshita, D. Yamamoto, N. Yokoshi, and S. Tsuchiya, “Current-induced instability of superfluid Fermi gases in optical lattices”, Proceedings of the 25th International Conference on Low Temperature Physics, J. Phys.: Conference Series, 150, 032128 (2009).
- S. Tsuchiya, F. Dalfovo, C. Tozzo, and L. Pitaevskii, “Stability and Excitations of Solitons in 2D Bose-Einstein condensates”, Proceedings of the 2006 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 148, pp.393-398 (2007).
- I. Danshita and S. Tsuchiya, “Landau and Dynamical Instabilities of Bose-Einstein Condensates in a Kronig-Penney Potential”, Proceedings of the 2006 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 148, pp.337-343 (2007).
- T. Kimura, S. Tsuchiya, M. Yamashita, and S. Kurihara, “Gutzwiller Study of Spin-1 Bosons in an Optical Lattice under a Magnetic Field”, Proceedings of International Laser Physics Workshop (LPHYS’05), Laser Physics 17, 54 (2007).
- I. Danshita, S. Kurihara, and S. Tsuchiya, “Elementary Excitations of Condensates in a Kronig-Penney Potential”, Proceedings of the 24th International Conference on Low Temperature Physics, AIP Conference Proceedings 850, 41 (2006).
- T. Kimura, S. Tsuchiya, and S. Kurihara, “Gutzwiller Study of Spin-1 Bosons in an Optical Lattice”, Proceedings of the 2004 International Conference on Quantum Fluids and Solids, J. Low Temp. Phys. 138, pp.651-656 (2005).
Non-refereed publications:
- S. Tsuchiya, “Pseudogap effects in the BCS-BEC crossover regime of an ultra cold Fermi gas” (in Japanese), Soryushi-ron Kenkyu, Vol. 119, 4C F77 (2012).
- S. Tsuchiya “Anomalous tunneling of Bogoliubov excitations in Bose-Einstein condensates” (in Japanese), Bussei Kenkyu, Vol. 94-1, 2 (2010).
Invited talks:
- I. Danshita, T. Nakayama, T. Nikuni, and S. Tsuchiya, "Fano resonance between Nambu-Goldstone modes and Higgs bound states in a superfluid", Ugo Fano Prize Symposium, Rome International Center for Material Science, Rome, Italy, December 17, 2015.
- S. Tsuchiya, R. Ganesh, and T. Nikuni, “Higgs mode in a superfluid of Dirac fermions”, International Workshop “Higgs modes in Condensed Matter and Quantum Gases”, Yukawa Institute of Theoretical Physics, Kyoto, Japan, June 24, 2014.
- S. Tsuchiya, R. Ganesh, and T. Nikuni, “The Higgs amplitude mode in a superfluid of Dirac fermions”, International Symposium on Quantum Fluids and Solids, Matsue, Japan, August 2, 2013.
- S. Tsuchiya, R. Watanabe, and Y. Ohashi, “Pseudogap behavior of a ultracold Fermi gas in the BCS-BEC crossover regime”, The 11th Asia Pacific Physics Conference (APPC11), Shanghai, China, November 2010.
- S. Tsuchiya, R. Watanabe, and Y. Ohashi, “Pseudogap signature in photoemission spectrum of an ultracold Fermi gas”, International Workshop “Ultracold Fermi Gas: Superfluidity and Strong Correlation” (USS-2010), Tokyo, Japan, May 2010.
- S. Tsuchiya and S. Kurihara, “Skyrmions in Spinor Bose-Einstein Condensates”, 10th annual International Laser Physics Workshop (LPHYS’01), Moscow, Russia, July 2001.
Awards:
- 2011 1st International Symposium on Access Spaces (IEEE-ISAS2011), Best Paper Award, "Theory of Photoemission-type Experiment in the BCS-BEC Crossover Regime of a Superfluid Fermi Gas”, by R. Watanabe, S. Tsuchiya, and Y. Ohashi.
- 2011 1st International Symposium on Access Spaces (IEEE-ISAS2011), Best Paper Award, "Superfluid/Ferromagnet/Superfluid-Junction and pi-Phase in a Superfluid Fermi Gas at Finite Temperature”, by T. Kashimura, S. Tsuchiya, and Y. Ohashi.
Research funding:
- 2014-2015 Grant-in-Aid for Young Scientists (B) (delegate) ¥2,340,000
- 2012-2013 Grant-in-Aid for Young Scientists (B) (delegate) ¥2,600,000
- Startup Research Fund in Tokyo University of Science (delegate) ¥1,000,000
- 2002-2004 Research Fund for Young Researchers in Waseda University (delegate) 1,500,000
- 2002-2004 Research Fund for Junior Research Fellow of the JSPS (delegate) ¥3,000,000