Outcomes from hard work

We report our results in scientific articles, book chapters and Ph.D. thesis. 

"*" denotes equal contribution in the authorship .

Journal articles


Probing NV and SiV charge state dynamics using high-voltage nanosecond pulse and photoluminescence spectral analysis

Artur Pambukhchyan, Sizhe Weng, Indu Aravind, Stephen B. Cronin and Susumu Takahashi

Mater. Quantum. Technol. 3, 035005 (2023). [doi] [arXiv]

P1 center electron spin clustering in type Ib diamond

Santiago Bussandri, Daphna Shimon, Asif Equbal, Yuhang Ren, Susumu Takahashi, Chandrasekhar Ramanathan and Songi Han

J. Am. Chem. Soc. 146, 5088 (2024). [doi] [arXiv]

Demonstration of NV-detected 13C NMR at 4.2 Tesla 

Yuhang Ren, Cooper Selco, Dylan Kawashiri, Michael Coumans, Benjamin Fortman, Louis S. Bouchard, Karoly Holczer and Susumu Takahashi

Phys. Rev. B 108, 045421 (2023). [doi] [arXiv].


Large Room Temperature Bulk DNP of 13C via P1 Centers in Diamond

Daphna Shimon, Kelly A. Cantwell, Linta Joseph, Ethan Q. Williams, Zaili Peng, Susumu Takahashi, Chandrasekhar Ramanathan

J. Phys. Chem. C 126, 41, 17777 (2022). [doi] [arXiv].

Numerical simulations for ferromagnetic resonance of nano-size island structures probed by radio-frequency scanning tunneling microscopy

Y. Sato, M. Haze, H. Yang, K. Asakawa, S. Takahashi, Y. Hasegawa

Jpn. J. Appl. Phys. 61, 025001 (2022). [doi] [].

Ultrahigh nitrogen-vacancy center concentration in diamond

Sándor Kollarics, Ferenc Simon, András Bojtor, Kristóf Koltai, Gergely Klujber, Máté Szieberth, Bence Gábor Márkus, Dávid Beke, Katalin Kamarás, Ádám Gali, Diego Amirari, Robert Berry, Salime Boucher, Dmitriy Gavryushkin, Gunnar Jeschke, Jason P. Cleveland, Susumu Takahashi, Péter Szirmai, László Forró, Eve Emmanouilidou, Rishabh Singh, Károly Holczer

Carbon 188, 393-400 (2022). [doi] [arXiv].


Electron-electron double resonance detected NMR spectroscopy using ensemble NV centers at 230 GHz and 8.3 Tesla

B. Fortman, L. Mugica-Sanchez, N. Tischler, C. Selco, Y. Hang, K. Holczer and, S. Takahashi

J. Appl. Phys. 130, 083901 (2021) - special topic collection, titled "Materials, Methods and Applications of Color Centers with Accessible Spin" [doi] [arXiv].

Determination of local defect density in diamond by double electron-electron resonance

S. Li,* H. Zheng,* Z. Peng,* M. Kamiya, T. Niki, V. Stepanov, A. Jarmola, Y. Shimizu, S. Takahashi, A. Wickenbrock and, D. Budker

Phys. Rev. B 104, 094307 (2021). [doi] [arXiv].


Microwave AC voltage induced phase change in Sb2Te3 nanowire

P. L. Tse, F. Tian, L. Mugica-Sanchez, O. Ruger, C. Ronning, A. Undisz, G. Mothrath, S. Takahashi and J. G. Lu

Nano Lett. 20, 8668 (2020). [doi] [arXiv].

Reduction of surface spin-induced electron spin relaxations in nanodiamonds

Z. Peng, J. Dallas and S. Takahashi

J. Appl. Phys. 128, 054301 (2020) [doi] [arXiv].

Demonstration of NV-detected ESR spectroscopy at 115 GHz and 4.2 Tesla

B. Fortman, J. Pena, K. Holczer and S. Takahashi

Appl. Phys. Lett. 116, 174004 (2020) [doi] [arXiv].


Understanding linewidth of ESR spectrum detected by a single NV center in diamond

B. Fortman and S. Takahashi

J. Phys. Chem. A 123, 6350-6355 (2019) [doi] [arXiv].

DNP-NMR of surface hydrogen on silicon microparticles

D. Shimon, K. J. van Schooten, S. Paul, Z. Peng, S. Takahashi, W. Kockenberger, C. Ramanathan

Solid State Nucl. Magn. Reson. 101, 68 (2019) [doi].

Investigation of Near-Surface Impurities of Nanodiamonds by High-Frequency EPR and DFT Calculation

Z. Peng, T. Biktagirov, F. H. Cho, U. Gertmann and S. Takahashi

J. Chem. Phys. 150, 134702 (2019) [doi] [arXiv].


Demonstration of Fidelity Improvement Using Dynamical Decoupling with Superconducting Qubits

B. Pokharel, N. Anand, B. Fortman and D. Lidar

Phys. Rev. Lett. 121, 220502 (2018); [link].


Review - Single spin magnetic resonance spectroscopy using a nitrogen-vacancy center in diamond (Japanese)

S. Takahashi

Kotaibutsuri May issue, 15 (2017); [link].

Investigation of coherence time of a nitrogen-vacancy center in diamond created by a low energy nitrogen implantation

C. Abeywardana, Z. Peng, L. C. Mugica, E. Kleinsasser, K.-M. C. Fu and S. Takahashi

Appl. Mag. Res. 48, 571-577 (2017); [doi].


Electron spin resonance spectroscopy of small ensemble paramagnetic spins using a single nitrogen-vacancy center in diamond

C. Abeywardana, V. Stepanov, F. H. Cho and S. Takahashi

J. Appl. Phys. 120, 123907 (2016); [doi].

Determination of nitrogen spin concentration in diamond using double electron-electron resonance

V. Stepanov and S. Takahashi

Phys. Rev. B 94, 024421 (2016); [doi].

High-frequency electron paramagnetic resonance spectroscopy of nitroxide-functionalized nanodiamonds in aqueous solution

R. D. Akiel, V. Stepanov and S. Takahashi

Cell Biochem. Biophys. 75, 151-157 (2016); [doi].

Investigating functional DNA grafted on nanodiamond surface using site-directed spin labeling and electron paramagnetic resonance spectroscopy

R. D. Akiel, X. Zhang, C. Abeywardana, V. Stepanov, P. Z. Qin and S. Takahashi

J. Phys. Chem. B 120, 4003-4008 (2016); [doi].

Spin coherence in a Mn3 single-molecule magnet

C. Abeywardana, A. M. Mowson, G. Christou, and S. Takahashi

Appl. Phys. Lett. 108, 042401 (2016); [doi].


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)

Book chapters

Microwave spectroscopy of Q1D and Q2D organic conductors

S. Hill and S. Takahashi

in The Physics of Organic Superconductors and Conductors, A. G. Lebed (eds.), Springer, New York (2008) [ISBN: 978-3-540-76667-4] [condmat/0608490]

Ph.D theses