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Articles by Junichiro Kono
Paramagnets as a platform for Dicke physics
Abstract The interaction of an ensemble of two-level atoms and a quantized electromagnetic field, described by the Dicke Hamiltonian, is an extensively studied problem in quantum optics. However, experimental efforts to explore similar physics in condensed matter typically employ bosonic matter modes (e.g., phonons, magnons, and plasmons) that are describable as simple harmonic oscillators, i.e., an infinite ladder of equally spaced energy levels.
Observation of mirror-odd and mirror-even spin texture in ultrathin epitaxially strained RuO 2 films
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Abstract INTRODUCTION RESULTS DISCUSSION MATERIALS AND METHODS Acknowledgments Supplementary Materials REFERENCES Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Recently, rutile ruthenium dioxide (RuO2) has attracted renewed interest due to expectations of prominent altermagnetic spin splitting. However, accumulating experimental evidence suggests that, in its bulk and thick-film forms, RuO2 does not display any form of magnetic ordering.
By Guobin Yu, Ruoqi Liu, Yichen Zhang, Seung Jeong, Luca Buiarelli, Seungjun Lee, Yucheng Guo, Jiaqin Wen, Hang Li, Sreejith S Nair, In Hyeok Choi, Zheng Ren, Ziqin Yue, Jounghoon Hyun, Tieqiong Zhang, Alexei N. Fedorov, Sung-Kwan Mo, Hojoon Lim, Adrian Hunt, Iradwikanari Waluyo, Junichiro Kono, Jan Minár, Jong Seok Lee, Tony Low, Turan Birol
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Science Magazine
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Realization of a chiral photonic-crystal cavity with broken time-reversal symmetry
Abstract Chiral cavities offer an intriguing way to manipulate material properties by breaking fundamental symmetries. However, only a few chiral cavity implementations exhibiting broken time-reversal symmetry have been demonstrated, with most relying on either strong magnetic fields, circularly polarized Floquet driving, or ultrastrong coupling between cavity modes and matter excitations.
Magnetic field-induced momentum-dependent symmetry breaking in a kagome superconductor
Abstract When several degrees of freedom in quantum materials have similar energy scales, the intertwined electronic orders, which exhibit broken symmetries, are often strongly coupled. Recent studies on kagome superconductors, such as CsV3Sb5, report rotational and time-reversal symmetry breaking linked to a charge density wave. Here we observe a momentum-selective response of the electronic structure of CsV3Sb5 to an external magnetic field.
Spin excitations and flat electronic bands in a Cr-based kagome superconductor - Nature Communications
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Abstract In the quest for topology- and correlation-driven quantum states, kagome lattice materials have garnered significant interest for their band structures, featuring flat bands (FBs) from the quantum destructive interference of the electronic wavefunction. Tuning an FB to the chemical potential could induce electronic instabilities and emergent orders.
By Zehao Wang, Yucheng Guo, Hsiao-Yu Huang, Bin Gao, Han Wu, Jun Okamoto, Chien-Te Chen, Feng Ye, Xingye Lu, Zhaoyu Liu, Zheng Ren, Yuan Fang, Yichen Zhang, Ziqin Yue, Cheng Hu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Makoto Hashimoto, Donghui Lu, Junichiro Kono, Jiun-Haw Chu, Boris I. Yakobson, Robert Birgeneau, Guang-Han Cao, Atsushi Fujimori, Ming Yi, Di-Jing Huang
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Nature
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Kramers nodal lines in intercalated TaS2 superconductors - Nature Communications
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Abstract Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal lines (KNLs), anchoring the Berry phase-related physics of electrons. However, an experimental demonstration for ideal KNLs well isolated at the Fermi level is lacking.
By Yichen Zhang, Yuxiang Gao, Aki Pulkkinen, Jianwei Huang, Yucheng Guo, Ziqin Yue, Mohamed Oudah, Xue-Jian Gao, Alberto Marmodoro, Alexei N. Fedorov, Sung-Kwan Mo, Makoto Hashimoto, Donghui Lu, Elio Vescovo, Junichiro Kono, Alannah M. Hallas, Robert Birgeneau, Luis Balicas, Jan Minár, Kam Tuen Law, Emilia Morosan, Anil Rajapitamahuni
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Nature
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Enabling solid sample analysis in liquid spectrophotometers with a 3D-printed cuvette - Scientific Reports
Abstract Most commercial systems for ultraviolet-visible (UV–VIS), Fourier-transform infrared, circular dichroism (CD), and fluorescence spectroscopies are designed for measurement of liquid samples. Moreover, adapters enabling the measurement of solid samples are expensive or unavailable for most commercial instruments. Consequently, there is a significant need for solid sample adapters that enable measurement of both liquid and solid samples with a single system.
Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film - Nature Communications
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Abstract Magnetic kagome materials provide a fascinating playground for exploring the interplay of magnetism, correlation and topology. Many magnetic kagome systems have been reported including the binary FemXn (X = Sn, Ge; m:n = 3:1, 3:2, 1:1) family and the rare earth RMn6Sn6 (R = rare earth) family, where their kagome flat bands are calculated to be near the Fermi level in the paramagnetic phase.
By Zheng Ren, Hengxin Tan, Aki Pulkkinen, Yichen Zhang, Yaofeng Xie, Lei Chen, Kevin Allen Verified, Han Wu, Junichiro Kono, Pengcheng Dai, Jian-Xin Zhu, Jan Minár, Binghai Yan
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Nature
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A frequency-agile retrodirective tag for large-scale sub-terahertz data backscattering - Nature Communications
Abstract Backscattering is a promising power-efficient communication technique providing sustainable wireless links with a low carbon footprint. This approach is a critical enabler for dense IoT networks, which are forecast to grow to 41 billion by 2025. However, existing backscatter designs are limited to the sub-6 GHz bands or narrowband operation in the millimeter-wave regime; therefore, they fail to concurrently support many interference-free low-power users.
Author Correction: Strong nonlinear optical processes with extraordinary polarization anisotropy in inversion-symmetry broken two-dimensional PdPSe - Light: Science & Applications
Correction to: Light: Science & Applications There are some changes in the Acknowledgements section of this article1.
Strong nonlinear optical processes with extraordinary polarization anisotropy in inversion-symmetry broken two-dimensional PdPSe - Light: Science & Applications
Abstract Nonlinear optical activities, especially second harmonic generation (SHG), are key phenomena in inversion-symmetry-broken two-dimensional (2D) transition metal dichalcogenides (TMDCs). On the other hand, anisotropic nonlinear optical processes are important for unique applications in nano-nonlinear photonic devices with polarization functions, having become one of focused research topics in the field of nonlinear photonics.
Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals - npj Quantum Materials
Abstract Charge density waves (CDWs) in kagome metals have been tied to many exotic phenomena. Here, using spectroscopic-imaging scanning tunneling microscopy and angle-resolved photoemission spectroscopy, we study the charge order in kagome metal ScV6Sn6. The similarity of electronic band structures of ScV6Sn6 and TbV6Sn6 (where charge ordering is absent) suggests that charge ordering in ScV6Sn6 is unlikely to be primarily driven by Fermi surface nesting of the Van Hove singularities.
Engineering chirality at wafer scale with ordered carbon nanotube architectures - Nature Communications
Abstract Creating artificial matter with controllable chirality in a simple and scalable manner brings new opportunities to diverse areas. Here we show two such methods based on controlled vacuum filtration - twist stacking and mechanical rotation - for fabricating wafer-scale chiral architectures of ordered carbon nanotubes (CNTs) with tunable and large circular dichroism (CD).
Optics & Photonics News - Quantum Mechanics for Tomorrow's Engineers
This book provides a clear and rigorous presentation of the fundamental principles and mathematical treatments of quantum mechanics and connects them to current and emerging applications in quantum computing, quantum communications and quantum sensors. With a primary audience of electrical engineering and materials science undergraduate students, the book is also valuable for professional engineers working in the areas above.
Kramers nodal lines and Weyl fermions in SmAlSi - Communications Physics
Abstract Kramers nodal lines (KNLs) have recently been proposed theoretically as a special type of Weyl line degeneracy connecting time-reversal invariant momenta. KNLs are robust to spin orbit coupling and are inherent to all non-centrosymmetric achiral crystal structures, leading to unusual spin, magneto-electric, and optical properties. However, their existence in in real quantum materials has not been experimentally established.
Phonon-Assisted Intertube Electronic Transport in an Armchair Carbon Nanotube Film
Abstract The electrical conductivity of a macroscopic assembly of nanomaterials is determined through a complex interplay of electronic transport within and between constituent nano-objects. Phonons play dual roles in this situation: their increased populations tend to reduce the conductivity via electron scattering, while they can boost the conductivity by assisting electrons to propagate through the potential-energy landscape.
K-point longitudinal acoustic phonons are responsible for ultrafast intervalley scattering in monolayer MoSe2 - Nature Communications
Abstract In transition metal dichalcogenides, valley depolarization through intervalley carrier scattering by zone-edge phonons is often unavoidable. Although valley depolarization processes related to various acoustic phonons have been suggested, their optical verification is still vague due to nearly degenerate phonon frequencies on acoustic phonon branches at zone-edge momentums.
Continuous transition between weak and ultrastrong coupling through exceptional points in carbon nanotube microcavity exciton-polaritons
Non-perturbative coupling of photons and excitons produces hybrid particles, exciton–polaritons, which have exhibited a variety of many-body phenomena in various microcavity systems. However, the vacuum Rabi splitting (VRS), which defines the strength of photon–exciton coupling, is usually a single constant for a given system.
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