K
Kevin O'Brien
Researcher at Massachusetts Institute of Technology
Publications - 44
Citations - 4038
Kevin O'Brien is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Metamaterial & Qubit. The author has an hindex of 20, co-authored 41 publications receiving 3037 citations. Previous affiliations of Kevin O'Brien include University of California & University of California, Berkeley.
Papers
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Journal ArticleDOI
Probing excitonic dark states in single-layer tungsten disulphide
Ziliang Ye,Ting Cao,Ting Cao,Kevin O'Brien,Hanyu Zhu,Xiaobo Yin,Yuan Wang,Steven G. Louie,Steven G. Louie,Xiang Zhang +9 more
TL;DR: Experimental evidence of a series of excitonic dark states in single-layer WS2 using two-photon excitation spectroscopy is reported, and it is proved that the excitons are of Wannier type, meaning that each exciton wavefunction extends over multiple unit cells, but with extraordinarily large binding energy.
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A near–quantum-limited Josephson traveling-wave parametric amplifier
C. Macklin,C. Macklin,Kevin O'Brien,David Hover,Mollie Schwartz,Vladimir Bolkhovsky,Xiang Zhang,Xiang Zhang,Xiang Zhang,William D. Oliver,Irfan Siddiqi +10 more
TL;DR: A superconducting amplifier based on a Josephson junction transmission line that exhibited high gain over a gigahertz-sized bandwidth and was able to perform high-fidelity qubit readout and has broad applicability to microwave metrology and quantum optics.
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Edge Nonlinear Optics on a MoS2 Atomic Monolayer
TL;DR: In this paper, the translational symmetry breaking of a crystal at its surface may form two-dimensional (2D) electronic states, and a nonlinear optical imaging technique that allows rapid and all-optical determination of the crystal orientations of the 2D material at a large scale.
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Phase Mismatch–Free Nonlinear Propagation in Optical Zero-Index Materials
Haim Suchowski,Kevin O'Brien,Zi Jing Wong,Alessandro Salandrino,Xiaobo Yin,Xiaobo Yin,Xiang Zhang,Xiang Zhang +7 more
TL;DR: It is shown that metamaterials can be designed with optical properties that relax the phase-matching requirements in nonlinear optics, and the experimental demonstration of phase mismatch–free nonlinear generation in a zero-index optical meetamaterial is reported.
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Predicting nonlinear properties of metamaterials from the linear response.
Kevin O'Brien,Haim Suchowski,Junsuk Rho,Alessandro Salandrino,Boubacar Kante,Xiaobo Yin,Xiang Zhang +6 more
TL;DR: It is shown that the nonlinear oscillator model does not apply in general to nonlinear metamaterials and it is possible to predict the relative nonlinear susceptibility of large classes of metammaterials using a more comprehensive nonlinear scattering theory.