Topological Matters Blog

Satoshi TANDA

Dept. of Applied Physics,
Hokkaido University
Sapporo 060-8628, Japan
                     Phone: +81-11-706-6154; +81-11-706-6075
                     Fax: +81-11-706-7293 ; +81-11-716-6175
                     Home Page: Topological Science and Technology Lab.





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”Experiment is the interpreter of nature. Experiments never deceive. It is our judgment that sometimes deceives itself, because it expects results that experiment refuses. We must consult experiment, varying the circumstances, until we have deduced general rules, for experiment alone can furnish reliable rules."

--Leonardo da Vinci

Interplay of real-space topology and momentum-space topology

Quantum Phase Transitions with the change of the internal topology.
Superconductor-Insulator Transitions in (2+1) dimensions
Dynamical Scaling under the parameter of Field, Disorder, and Topology
Nonequilibrium Phase Transitions in CDW-dynamics
Macroscopic Quantum Tunneling of Topological Defects
(Vortices, Phase Solitons of CDW, Dislocations)

Topological Matter

Discover of NbSe3 Ring, Tube, Disk-Crystals
Discover of New Type Topological Materials
Topological Defects on the Topological Materials
Order Parameter on the Topological Materials
Knot-Crystals , Mobius Crystals


Research in my group has mainly focused on one theme: transport phenomena (of electrons, vortices, charge density wave) in systems that have disorder and/or reduced dimensionality and/or topological constrain. Examples include confined geometries (e.g., films, slabs, wires, networks, Mobius strip), multilayers, aperiodic, and disordered media. We use MBE, AFM, CVT, and FIB techniques to find new phenomena experimentally, and we often collaborate with theoretical groups. Specific problems we are studying include: dynamics of superconducting vortices in disordered media; nonlinear threshold dynamics, collapse, avalanches, and instabilities in granular and superconducting systems; magnetic and thermal properties of high-TC materials; hole dynamics and other properties of quantum antiferromagnets; phonon and electron transport in quasicrystalline and other aperiodic systems; acoustic interference, phonon localization and universal transmission fluctuations; quantum fluctuations in solids; and quantum interference due to electron motion in magnetic fields in a variety of systems (including superconducting wire networks and Josephson junction arrays). Under certain circumstances, several of these apparently unrelated systems exhibit interesting complex nonlinear dynamics when driven to the threshold of instability.

Publications (Selected)

Topological Crystals

Selective optical probing of the charge-density-wave phases in NbSe3 
K. Shimatake, Y. Toda, and S. Tanda
Phys. Rev. B 75, 115120 (2007).
[ PDF ]

Topologically linked crystals
T.Matsuura, M.Yamanaka, N. Hatakenaka, T. Matsuyama, and S. Tanda,
Journal of Crystal Growth 297, 157 (2006). [ PDF ]

Supercluster of Electrons in Ultrathin TaSe2 Nanocrystals
T.Toshima, K.Inagaki, N. Hatakenaka, and S. Tanda,
J. Phys. Soc. Jpn. 75, 024706 (2006). [ PDF ]

Quenching of phase coherence in quasi-one-dimensional ring crystals 
K. Shimatake , Y. Toda, and S. Tanda
Phys. Rev. B 73, 153403 (2006).
[ PDF]

Topological effect of charge density waves in ring-shaped crystals of NbSe3
T.Matsuura, T.Tsuneta, K. Inagaki, and S. Tanda,
Phys. Rev. B 73, 165118 (2006). [ PDF ]

Violation of Kohler's Rule in the Magnetoresistance near the Lower Charge-Density-Wave Instability in NbSe3
S. Yasuzuka, K. Yamaya, Y. Okajima, S. Tanda, N. Takeshita, H. Mitamura, T. Nakanishi and N. Mori
J. Phys. Soc. Jpn. 74, 1187 (2005).[ PDF ]

Finite-size effects on transverse magnetoresistance of NbSe3
Yamaguchi Takahide, S.Uji, K.Enomoto, T.Konoike, T.Terashima, M. Nishimura,T.Tsuneta, K.Inagaki, S.Tanda, and K.Yamaya
Phys. Rev. B 71, 134409 (2005). [ PDF ]

Fabrication of nanoscale charge density wave systems
K. Inagaki, T. Toshima, S. Tanda, K. Yamaya, and S. Uji
Appl. Phys. Lett. 86, 073101 (2005). [ PDF ]

Anomalous doping effect on Ag-doped DNA conductor
H. Mayama, T. Hiroya, K. Inagaki, S. Tanda and K. Yoshikawa
Chem. Phys. Lett. 397, 101 (2004). [ PDF ] [ kaisetu ]

Formation and growth of NbSe3 topological crystals
T. Tsuneta and S. Tanda
Journal of Crystal Growth 267, 223 (2004). [ PDF ]

Anomalous coherent phonon oscillations in the commensurate phase of the quasi-two-dimensional 1T-TaS2 compound
Y.Toda, K.Tateishi, and S.Tanda
Phys. Rev. B70, 033106 (2004).
 [ PDF ]

Formation of metallic NbSe2 nanotubes and nanofibers

T. Tsuneta, T. Toshima, K. Inagaki, T. Shibayama, S. Tanda, S. Uji, M. Ahlskog, P. Hakonen and M. Paalanen
Current Appl. Phys. vol.3, 473 (2003)
[ PDF ]

A Mobius strip of single crystals
S. Tanda, T. Tsuneta, Y. Okajima, K. Inagaki, K. Yamaya, and N. Hatakenaka
Nature 417, 397 (2002). [ PDF ]

New formation of Topological Matter of NbSe3
S. Tanda, T. Tsuneta, Y. Okajima, and K. Yamaya
Electronic Properties of Molecular Nanostructures, Tirol Austria
AIP Conf.Proc.591, 473 (2001).

Effect of spin substitution on stripe order in La1.875Ba0.125Cu1-yMyO4 (M = Zn or Ni)
O. Anegawa, Y. Okajima, S. Tanda, and K. Yamaya
Phys. Rev. B 63, 140506(R) (2001). [ PDF ]

Fluxon dynamics in isolated long Josephson junctions
Y. Kasai, S. Tanda, N. Hatakenaka, H. Takayanagi
Physica C 352, (2001) 211.

Single Crystal Rings of NbSe3: A system for CDW Interference
S. Tanda, H. Kawamoto, M. Shiobara, Y. Okajima, S. Yasuzuka, K. Yamaya
Physica B 284-288 (2000) 1657. [ pdf ]

Charge-Density-Wave sliding in ring-shaped crystals of NbSe3
Y. Okajima, H. Kawamoto, M. Shiobara, K. Matsuda, S. Tanda, K. Yamaya
Phisica B 284-288 (2000) 1659. [ pdf ]

Pressure-Induced Magnetoresistance in NbSe3
S. Yasuzuka, Y. Okajima, S. Tanda, N. Takeshita1, N. Mori and K. Yamaya
J. Phys. Soc. Jpn, 69 (2000) 3470. [ pdf ]

Double sine-Gordon fluxons in islated long Josehpson junctions
N.Hatakenaka, H. Takayanagi, Y. Kasai, and S. Tanda
Physica B 284-288, (2000) 563.

Quantum Collective Dynamics of Charge Density Waves in
Quasi-One-Dimensional Orthorhombic TaS3
K.Matsuda, S.Tanda, M.Shiobara, Y.Okajima, K.Yamaya and N.Hatakenaka
J. Phys. Soc. Jpn, 69 (2000) 1251. [ pdf ]

Quantum Critical Behavior in Itinerant Ferromagnet PdNi
M.Yamda and S.Tanda
Physica B 281&282, (2000) 384

Effect of Zn or Ni-substitution on specific heat in LaBaCuO:
Role of Spin Interaction in Stripe Phase
O.Anegawa, Y.Okajima, S.Tanda K.Yamaya
Physica B 281&282, (2000) 918

Possibility of Dynamic Transition in sliding Charge-Density-Waves
K.Matsuda and S.Tanda
Solid State Comm. 113, (2000) 451 [ pdf ]

Pressure effect on large magnetoresistance in the lower
charge-density-wave transition of NbSe3;
S.Yasuzuka, Y.Okajima, S.Tanda and K.Yamaya
Phys. Rev. B 60, (1999) 4406. [ pdf ]

Ring-shaped crystals of NbSe3 and TaSe3
S.Tanda, H.Kawamoto, M.Shiobara, Y.Okajima and K.Yamaya
J. Phys. IV France 9 (1999) 379 [ pdf ]

Pressure effects on the CDW transitions and magnetoresistances in NbSe3
S.Yasuzuka, Y.Okajima, S.Tanda, K.Yamaya, N.Takeshita and N.Mori
J. Phys. IV France 9 (1999) 207.

Effect of High Magnetic Fields on the Charge-Density-Wave State in NbSe3;
S.Yasuzuka, Y.Okajima, S.Tanda and K.Yamaya
Journal of Superconductivity 12 (1999) 597.

Dimensional Crossover of Quantum Nucleation Processes in Charge-Density-Wave
Phase Slips
N.Hatakenaka, M.Shiobara, K.Matsuda, and S.Tanda
Phys. Rev. B 57 (1998) R2003-2005. [ pdf ]

Possibility of Macroscopic Resonant Tunneling near the Superconductor-Insulator
Transition in YBa2Cu3O7 Thin Films
S.Tanda, K.Kagawa, T.Maeno, T.Nakayama, K.Yamaya, A.Ohi and N.Hatakenaka
Europhys. Lett. 41 (1998) 425-429. [ pdf ]

Hall coefficients in the superconductor-insulator transition of Bi2Sr2CuO6:
Measurement of Hall-bar shaped single crystals fabricated by excimer-laser cutting
K.Inagaki, S.Tanda and K. Sajiki
Appl. Phys. Lett. 69 (1997) 3075-3077. [ pdf ]

Transport properties of Bi2Sr2CuO6 single crystals:
Possibility of interplane coupling in the weakly localized regime
K.Inagaki and S.Tanda
Phys. Rev. B53 (1996) R8902-8905. [ pdf ]

Superconductor-Insulator Transition in Ultrathin Pb Films:
Localization and Superconducting Coherence
K.Kagawa, K.Inagaki, and S.Tanda
Phys. Rev. B53 (1996) R2979-2982. [ pdf ]

Variable-range-hopping-type Transport near the Superconductor-Insulator
Transition observed in Nd2-xCexCuO4 Thin Films"
S.Tanda and T.Nakayama
Phil. Mag. Lett. 72 (1995) 223-229. [ pdf ]

Nonlinear Conductivity in Bi2Sr2CuO6 Single Crystals
K.Inagaki, S.Tanda, and T.Nakayama
Physica C 235-240 (1994) 1361-1362abstract

Scaling Behavior of the Conductivity of Nd2CuO4-xFx Single Crystals:
Evidence for Orthogonal Symmetry
S.Tanda, K.Takahashi, and T.Nakayama
Phys. Rev. B49 (1994) R9260-9263. [ pdf ]

Longitudinal Negative Magnetoresistance in NdCeCuO:
Evidence for Kondo-like Behavior,
S.Tanda, S.Ohzeki and T.Nakayama,
Physica B 194-196 (1994) 1967-1968.

Scaling of the Conductivity of Nd2CuO4-xFx Single Crystals:
Experimental Evidence for 2D Fermi Liquid Behavior,
S.Tanda, K.Takahashi and T.Nakayama
Physica B 194-196 (1994) 1961-1962.

Electron Tunneling into Epitaxial Films of NdCeCuO,
M.Homma, S.Tanda and T.Nakayama,
Appl. Phys. Lett. 61, (1993) 1724-1726.[ pdf ]

Bose-Glass-Vortex-Glass Phase Transition and Dynamic Scaling for
High-Tc NdCeCuO Thin Films,
S.Tanda, S.Ohzeki and T.Nakayama,
Phys. Rev. Lett.69, (1992) 530-533. [ pdf ]

Superconductor-Insulator Transition in NdCeCuO Single-Crystal Thin Film,
S.Tanda, S.Ohzeki, M.Honma, A.Ohi and T.Nakayama,
Physica C 185-189, (1991) 1323-1324.

Critical Sheet Resistance Observed in High-Tc Oxide-Superconductor
NdCeCuO Thin Films,
S. Tanda, M. Honma and T.Nakayama,
Phys. Rev. B 43, (1991) R8725-8728. [ pdf ]

Invited Talk
5,289,171 Full-Text Color display apparatus
5,164,225 Full-Text Method of fabricating thin-film EL device
5,072,263 Full-Text Thin film EL device with protective film





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