T. Suzuki

University of Tsukuba

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C. Bromberg

Michigan State University

P. Lukens

Fermi National Accelerator Laboratory

Y. S. Chung

University of Rochester

M. Shimojima

University College London

W. C. Wester

Fermi National Accelerator Laboratory

J. Dittmann

Baylor University

J. Yoh

Fermi National Accelerator Laboratory

B. Kilminster

University of Zurich

A. Artikov

Joint Institute for Nuclear Research

G. Introzzi

University of Pavia

Cooperative Institutions

Fermi National Accelerator Laboratory

494

Children's Defense Fund

398

Istituto Nazionale di Fisica Nucleare

361

European Organization for Nuclear Research

350

Universidad de Cantabria

295

University of California, Los Angeles

295

Instituto de Física de Cantabria

294

Institute of High Energy Physics

284

National and Kapodistrian University of Athens

268

University of Bologna

250

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Giant nonlinear optical effects induced by nitrogen-vacancy centers in diamond crystals

Optics Express (2019)

Mari Motojima T. Suzuki Hidemi Shigekawa Yuta Kainuma Toshu An

We investigate the effect of nitrogen-vacancy (NV) centers in single crystal diamond on nonlinear optical effects using 40 fs femtosecond laser pulses. The near infrared femtosecond pulses allow us to study purely nonlinear optical effects, such as optical Kerr effect (OKE) and two-photon absorption (TPA), relating to unique optical transitions by electronic structures with NV centers. It is found that both the nonlinear optical effects are enhanced by the introduction of NV centers in the N$^{+}$ dose levels of 2.0$\times$10$^{11}$ and 1.0$\times$10$^{12}$ N$^{+}$/cm$^{2}$. In particular, our data demonstrate that the OKE signal is strongly enhanced for the heavily implanted type-IIa diamond. We suggest that the strong enhancement of the OKE is possibly originated from cascading OKE, where the high-density NV centers effectively break the inversion symmetry near the surface region of diamond.

10.1364/oe.27.032217

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Citations (23)

Search for Gluinos and Scalar Quarks in pp¯ Collisions at s=1.8 TeV Using the Missing Energy plus Multijets Signature

Physical Review Letters (2002)

A. A. Affolder H. Akimoto A. Akopian M. Albrow P. Amaral

We have performed a search for gluinos (g) and scalar quarks (q) in a data sample of 84 pb(-1) of pp collisions at square root[s] = 1.8 TeV, recorded by the Collider Detector at Fermilab. We investigate the final state of large missing transverse energy and three or more jets, a characteristic signature in R-parity-conserving supersymmetric models. The analysis has been performed "blind," in that the inspection of the signal region is made only after the predictions from standard model backgrounds have been calculated. Comparing the data with predictions of constrained supersymmetric models, we exclude gluino masses below 195 GeV/c2 (95% C.L.), independent of the squark mass. For the case m(q) approximately m(g), gluino masses below 300 GeV/c2 are excluded.

Gluino

Missing energy

Fermilab

10.1103/physrevlett.88.041801

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Citations (80)

Enhancement of coherent phonon amplitude in phase-change materials by near-infrared laser irradiation

Applied Physics Letters (2017)

T. Suzuki Yuta Saito Paul Fons Alexander V. Kolobov Junji Tominaga

We have examined the effect of pump-probe photon energy on the amplitude of coherent optical phonons in a prototypical phase change material using a femtosecond time-resolved transmission technique. The photon energy was varied between 0.8 and 1.0 eV (corresponding to the wavelengths of 1550 and 1200 nm), a range over which there is significant optical contrast between the crystalline and amorphous phases of Ge2Sb2Te5 (GST225). It was found that in crystalline GST225, the coherent phonon amplitude monotonically increases as the photon energy increases, indicating that the phonon amplitude is enhanced by interband optical absorption, which is associated with the imaginary part of the dielectric function. In amorphous GST225, in contrast, the coherent phonon amplitude does not depend on the photon energy, remaining almost constant over the tuning range. A possible contribution from the polarizability associated with the resonant bonding nature of GST225 is discussed.

Photon energy

10.1063/1.5003346

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Citations (4)

Electronic and Optical Properties of Bulk and QW Structures

CRC Press eBooks (2000)

T. Suzuki

Central Research Laboratories, Matsushita Electric Industrial Co., Ltd., 3-4 Hikaridai, Seikacho, Kyoto 619-02, Japan1. In tro d u c tio n ................................................................................... 264 2. Electronic Band Structures of Bulk GaN and A I N .................... 2652.1. Method of First-Principles Band C alcu lations....................265 2.2. Results of First-Principles Band C a lcu la tio n s........................ 266 2.3. Strain Effect on Electronic Band S tru c tu res ........................269

10.1201/9781482298147-12

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Citations (1)

D. レーザープロセシング

The Review of Laser Engineering (1998)

M. Murahara M. Tomita T. Ikegame S. Itoh K. Hatao

10.2184/lsj.26.supplement_115

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Citations (0)

All‐Optical Detection of Periodic Structure of Chalcogenide Superlattice Using Coherent Folded Acoustic Phonons

physica status solidi (RRL) - Rapid Research Letters (2018)

T. Suzuki Yuta Saito Paul Fons Alexander V. Kolobov Junji Tominaga

Chalcogenide superlattices (SL) consist of alternately stacked GeTe and Sb 2 Te 3 layers. The structure can act as a 3D topological insulator depending on the constituent layer thicknesses, making the design of the SL period a central issue for advancing chalcogenide SL as potential candidates for spin devices as well as for optimization of the current generation of phase‐change memory devices. Here we explore the periodic structure of chalcogenide SL by observing coherent folded longitudinal acoustic (FLA) phonons excited by femtosecond laser pulse irradiation. The peak frequency of the FLA modes is observed to change upon variation of the thickness of the GeTe layer, which is well reproduced by means of an elastic continuum model. In addition, a new SL structure is unveiled for a sample consisting of thin GeTe and Sb 2 Te 3 layers, which suggests intermixing of Ge atoms. This all‐optical technique based on observation of coherent FLA modes offers a non‐destructive characterization of superlattice structures at atomic resolution.

Topological insulator

10.1002/pssr.201800246

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[Formula presented] Production and Polarization in [Formula presented] Collisions at [Formula presented]

Archive ouverte UNIGE (University of Geneva) (2002)

D. Acosta A. A. Affolder H. Akimoto M. G. Albrow P. Amaral

Source

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Search for narrow diphoton resonances and forγγ+W/Zsignatures inpp¯…

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (2001)

A. A. Affolder H. Akimoto A. Akopian M. Albrow P. Amaral

We present results of searches for diphoton resonances produced both inclusively and also in association with a vector boson (W or Z) using 100 pb^{-1} of p\bar p collisions using the CDF detector. We set upper limits on the product of cross section times branching ratio for both p\bar p\to\gamma\gamma + X and p\bar p\to\gamma\gamma + W/Z. Comparing the inclusive production to the expectations from heavy sgoldstinos we derive limits on the supersymmetry-breaking scale sqrt{F} in the TeV range, depending on the sgoldstino mass and the choice of other parameters. Also, using a NLO prediction for the associated production of a Higgs boson with a W or Z boson, we set an upper limit on the branching ratio for H\to\gamma\gamma. Finally, we set a lower limit on the mass of a `bosophilic' Higgs boson (e.g. one which couples only to \gamma, W, and Z$ bosons with standard model couplings) of 82 GeV/c^2 at 95% confidence level.

Branching fraction

Bar (unit)

Vector boson

10.1103/physrevd.64.092002

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Citations (27)

Measurement of the inclusive jet cross section using thekTalgorithm inpp¯collisions at

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2007)

A. Abulencia J. Adelman A. A. Affolder T. Akimoto M. Albrow

We report on measurements of the inclusive jet production cross section as a function of the jet transverse momentum in pp¯ collisions at s=1.96 TeV, using the kT algorithm and a data sample corresponding to 1.0 fb−1 collected with the Collider Detector at Fermilab in run II. The measurements are carried out in five different jet rapidity regions with |yjet|<2.1 and transverse momentum in the range 54

10.1103/physrevd.75.092006

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Citations (141)

Raman scattering of NiS2

Solid State Communications (1977)

T. Suzuki K. Uchinokura Tomoyuki Sekine E. Matsuura

Crystal (programming language)

10.1016/0038-1098(77)90967-x

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Citations (63)