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Susumu Takahashi

Assistant Professor of Chemistry
Physical Chemistry

Ph.D. 2005, University of Florida
M.S. 1997, Aoyama-Gakuin University, Tokyo, Japan
B.S. 1995, Aoyama-Gakuin University, Tokyo, Japan
Office: LJS 152
Phone: (213) 821-3187
Fax: (213) 740-2701
 Group Homepage

Research Focus


We are an interdisciplinary experimental group overlapping nanoscience and structural biology dedicated to developing novel magnetic resonance and microscopy techniques and understanding complex dynamics in biological systems and quantum systems.

The Takahashi group website

Figure. Detection and investigation of a single spin in diamond.

Selected publications



    Spin coherence in a Mn3 single-molecule magnet
    C. Abeywardana, A. M. Mowson, G. Christou, and S. Takahashi
    Submitted (2015);

    DNA bar-coding of nanodiamonds characterized using spin-labeling and Electron Paramagnetic Resonance spectroscopy
    R. Akiel, X. Zhang, C. Abeywardana, V. Stepanov, P. Z. Qin and S. Takahashi
    Submitted (2015);

    Electron paramagnetic resonance spectroscopy of a small ensemble of spins using a single nitrogen-vacancy center in diamond
    C. Abeywardana, V. Stepanov, F. H. Cho and S. Takahashi
    Submitted (2015); [arXiv].

    230/115 GHz electron paramagnetic resonance/double electron-electron resonance spectroscopy
    F. H. Cho, V. Stepanov, C. Abeywardana and S. Takahashi
    Methods Enzymol. 563 , 95 (2015); [doi].

    High-frequency and high-field optically detected magnetic resonance of nitrogen-vacancy centers in diamond
    V. Stepanov, F. H. Cho, C. Abeywardana and S. Takahashi
    Appl. Phys. Lett. 106 , 063111 (2015); [doi].


    Magnetic resonance spectroscopy using a single nitrogen-vacancy center in diamond
    C. Abeywardana, V. Stepanov, F. H. Cho and S. Takahashi
    Proc. SPIE 9269 , 92690K (2014); [doi].

    A high-frequency electron paramagnetic resonance spectrometer for multi-dimensional, -frequency and -phase pulsed measurements
    F. H. Cho, V. Stepanov and S. Takahashi
    Rev. Sci. Instrum. 85 , 075110 (2014); [doi].

    Low temperature synthesis and characterization of Lanthanide-doped BaTiO3 nanocrystals
    S. P. Culver, V. Stepanov, M. Mecklenburg, S. Takahashi and R. L. Brutchey
    Chem. Commun. 50 , 3480 (2014); [doi].


    Grafting nitroxide radicals on nanodiamond surface using click chemistry
    E. E. Romanova, R. Akiel, F. H. Cho and S. Takahashi
    J. Phys. Chem. A 117 , 11933 (2013); [doi].

    Spin decoherence and electron spin bath noise of a nitrogen-vacancy center in diamond
    Z.-H. Wang and S. Takahashi
    Phys. Rev. B 87 , 115122 (2013); [doi].


    Pulsed electron paramagnetic resonance spectroscopy powered by a free-electron laser
    S. Takahashi, L.-C. Brunel, D. T. Edwards, J. van Tol, G. Ramian, S. Han & M. S. Sherwin
    Nature 489 , 409-413 (2012); [doi].
    Media releases:
    "Laser helps scientists ‘see' the smallest world" - USC
    "Scientists Employ a Powerful UCSB Laser to Breathe New Life into an Old Technology for Studying Atomic-Level Structures" - UC Santa Barbara

    Distance measurements across randomly distributed nitroxide probes from the temperature dependence of the electron spin phase memory time at 240 GHz 
    D. T. Edwards, S. Takahashi, M. S. Sherwin and S. Han
    J. Mag. Res. 223 , 198-206 (2012); [doi].


    Decoherence in Crystals of Quantum Molecular Magnets 
    S. Takahashi, I. S. Tupitsyn, J. van Tol, C. C. Beedle, D. N. Hendrickson, and P. C. E. Stamp
    Nature 476, 76 (2011) [doi].
    Media releases:
    "USC Scientists Contribute to a Breakthrough in Quantum Computing" - USC
    "Researchers Develop Quantum Computing System that Resists ‘Quantum Bug'" - UC Santa Barbara
    "Discovery may overcome obstacle for quantum computing: UBC, California researchers" - University of British Columbia


    Cavity dumping of an injection-locked free-electron laser
    S. Takahashi, G. Ramian, and M. S. Sherwin
    Appl. Phys. Lett. 95, 234102 (2009) [doi]

    Coherent Manipulation and Decoherence of S=10 Single-Molecule Magnets
    S. Takahashi, J. van Tol, C. C. Beedle, D. N. Hendrickson, L.-C. Brunel, and M. S. Sherwin
    Phys. Rev. Lett. 102, 087603 (2009) [doi] 

    High-Field Phenomena of Qubits
    J. van Tol, G. W. Morley, S. Takahashi, D. R. McCamey, C. Boehme, M. E. Zvanut
    Appl. Mag. Res. 36, 259 (2009)


    Quenching Spin Decoherence in Diamond through Spin Bath Polarization
    S. Takahashi, R. Hanson, J. van Tol, M. S. Sherwin and D. D. Awschalom
    Phys. Rev. Lett. 101, 047601 (2008) [doi]
    Chosen as PRL editor’s suggestions, highlighted in Physics Synopses “Quantum Coherence in Cold Baths”. 

    Large Mn25 Single-Molecule Magnet with Spin S=51/2: Magnetic and High-Frequency Electron Paramagnetic Resonance Spectroscopic Characterization of a Giant Spin State
    M. Murugesu, S. Takahashi, A. Wilson, K. A. Abboud, W. Wernsdorfer, S. Hill, G. Christou
    Inorg. Chem. 47, 9459 (2008)

    Pulsed EPR spectrometer with injection-locked UCSB free-electron laser
    S. Takahashi, D.G. Allen, J. Seifter, G. Ramian,M.S. Sherwin,J. van Tol,L.-C. Brunel
    Infrared Phys. Tech. 55, 426 (2008) [doi]


    Submegahertz linewidth at 240 GHz from an injection-locked free-electron laser
    S. Takahashi, G. Ramian, M. S. Sherwin, L.-C. Brunel and J. van Tol
    Appl. Phys. Lett. 91, 174102 (2007) [doi]

    A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control
    D. G. Allen, L. Persechini, S. Takahashi, G. Ramian and M. S. Sherwin
    Rev. Sci. Instrum. 78, 113103 (2007) [doi]

    The UCSB MM-FEL Injection Locking System
    G. Ramian, S. Takahashi and M. S. Sherwin
    Proceeding of FEL 2007, Novosibirsk, Russia (2007)


    Are Lebed’s magic angles truly magic?
    S. Takahashi, A. Betancur-Rodiguez, S. Hill, S. Takasaki, J. Yamada and H. Anzai
    J. Low Temp. Phys. 142 Nos. 3/4, 311 (2006)

    Study of non-magnetic impurity effects of the organic superconductor (TMTSF)2ClO4
    S. Takahashi, S. Hill, S. Takasaki, J. Yamada and H. Anzai
    AIP Conference Proceedings 850, 619 (2006)


    Periodic-orbit resonance in the quasi-1D organic superconductor (TMTSF)2ClO4
    S. Takahashi, S. Hill, S. Takasaki, J. Yamada and H. Anzai
    Phys. Rev. B 72, 024540 (2005) [doi]

    A rotating cavity for high-field angle-dependent microwave spectroscopy of low-dimensional conductors and magnets
    S. Takahashi and Stephen Hill
    Rev. Sci. Instrum. 76, 023114 (2005) [doi]

    Angle-resolved mapping of the Fermi velocity in quasi-two-dimensional conductors and superconductors: probing quasiparticles in nodal superconductors
    S. Takahashi and Stephen Hill
    J. Appl. Phys. 97, 10B106 (2005)

    Fermi surface studies of quasi-1D and quasi-2D organic superconductors using periodic orbit resonances in high magnetic fields
    S. Takahashi, A. E. Kovalev, S. Hill, S. Takasaki, J. Yamada, H. Anzai, J. S. Qualls, K. Kawano, M. Tamura, T. Naito and H. Kobayashi
    Int. J. Mod. Phys. B 18 Nos. 27-29, 3499-3504 (2004)
    Also in Proc. Int. Conf. on High Magnetic Field in Semiconductor Physics (SemiMag 16), Y. J. Wang, L. Engel and N. Bonesteel (eds.)
    World Scientific, Singapore (2005); IBSN: 981-256-290-7

    A comparison between high-symmetry Mn12 single-molecule magnets in different ligand/solvent environments
    S. Hill, N. Anderson, A. Wilson, S. Takahashi, K. Petukhov, N. E. Chakov, M. Murugesu, J. M. North, E. del Barco, A. D. Kent, N. S Dalal, and G. Christou
    Polyhedron 24, 2280 (2005)

    A spectroscopic comparison between several high-symmetry S = 10 Mn12 single-molecule magnets
    S. Hill, N. Anderson, A. Wilson, S. Takahashi, N. E. Chakov, M. Murugesu, J. M. North, N. S. Dalal, and G. Christou
    J. Appl. Phys. 97, 10M510 (2005)


    Discrete easy-axis tilting in Mn12-acetate, as determined by EPR: implications for the magnetic quantum tunneling mechanism
    S. Takahashi, R. S. Edwards, J. M. North, S. Hill and N. S. Dalal
    Phys. Rev. B 70, 094429 (2004) [doi]

    Temperature dependence of the Josephson plasma resonance between vortex phases in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2
    D. K. Benjamin, S. Takahashi, S. Hill and J. S. Qualls
    Solid State Comm. 131, 719 (2004)

    High field high frequency EPR techniques and their application to single molecule magnets
    R. S. Edwards, S. Hill, P. Goy, R. Wylde and S. Takahashi
    Physica B 346-347, 211 (2004)


    Effect of an in-plane magnetic field on the interlayer phase coherence in the extreme-2D organic superconductor κ-(BEDT-TTF)2Cu(NCS)2
    A. E. Kovalev, S. Takahashi, S. Hill and J. S. Qualls
    Int. J. Mod. Phys. B 17 Nos. 18-20, 3547 (2003)

    Periodic orbit resonance in (TMTSF)2ClO4
    A. E. Kovalev, S. Hill, S. Takahashi, T. N. Dhakal, S. Takasaki, J. Yamada H. Anzai and J. S. Brooks
    J. Appl. Phys. 93, 8665 (2003)

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