Explanipedia

Uni-traveling-carrier photodiode based on MoS2/GaN van der Waals heterojunction for high-speed visible-light detection Open

T. Serikawa, Atsushi ICHIKAWA, Yuji Ohmaki, Yoshihiro Iwasa, Hisashi Ogawa · 2025

Uni-traveling-carrier photodiodes (UTC-PDs), which utilize only electrons as the active carriers, have become indispensable in high-speed optoelectronics due to their unique capabilities, such as high saturation power and broad bandwidth. …

Visualizing Molecular-Scale 3D Distributions of Ionic Liquids in Electric Double-Layer Capacitor by 3D Scanning Force Microscopy with Variable Tip/Sample Bias Voltages Open

Takahiko Ikarashi, Takashi Sumikama, Kaito Hirata, Ryo Sakakibara, Takumi Yoshino , et al. · 2025

Atomic force microscopy (AFM) imaging of ionic liquid (IL) distribution in electric double-layer (EDL) devices has been actively explored to understand the origin of their excellent performance. However, this has been impeded by insufficie…

Misfit layered superconductor (PbSe)1.14(NbSe2)3 with possible layer-selective FFLO state Open

Yuki M. Itahashi, Yamato Nohara, Michiya Chazono, Hideki Matsuoka, Koichiro Arioka , et al. · 2025

Two-dimensional (2D) superconductors are known for their novel emergent phenomena, however, lack of experimental probes beyond resistivity has hindered further exploration of diverse superconducting states. Bulk 2D superconductors, with su…

Misfit layered superconductor (PbSe)1.14(NbSe2)3 with possible layer-selective FFLO state Open

Yuki M. Itahashi, Yamato Nohara, Michiya Chazono, Hideki Matsuoka, Koichiro Arioka , et al. · 2025

Two-dimensional (2D) superconductors are known for their novel emergent phenomena, however, lack of experimental probes beyond resistivity has hindered further exploration of diverse superconducting states. Bulk 2D superconductors, with su…

Research on Quantum Materials and Quantum Technology at RIKEN Open

Koji Ishibashi, Shinichi Yorozu, T. Arima, Minoru Kawamura, Yoshinori Tokura , et al. · 2025

RIKEN covers fundamental research on physics, chemistry, biology, life and medical science, information and mathematical science, and engineering. Here, we outline research activities on quantum materials and quantum technology that includ…

Absence of diode effect in chiral type-I superconductor NbGe2 Open

Dong Li, Zouyouwei Lu, Wenxin Cheng, Xiaofan Shi, Lihong Hu , et al. · 2025

Symmetry elegantly governs the fundamental properties and derived functionalities of condensed matter. For instance, realizing the superconducting diode effect (SDE) demands breaking space-inversion and time-reversal symmetries simultaneou…

Absence of diode effect in chiral type-I superconductor NbGe2 Open

Dong Li, Zouyouwei Lu, Wenxin Cheng, Xiaofan Shi, Lihong Hu , et al. · 2025

Symmetry elegantly governs the fundamental properties and derived functionalities of condensed matter. For instance, realizing the superconducting diode effect (SDE) demands breaking space-inversion and time-reversal symmetries simultaneou…

Molecularly-anchored single PbS quantum dots as resonant tunnelling transistors Open

Retno Dwi Wulandari, Dongbao Yin, Ricky Dwi Septianto, Seiichiro Izawa, Yoshihiro Iwasa , et al. · 2025

Ten negative differential resistances (NDRs) were demonstrated in the output characteristics of molecularly-anchored single PbS quantum dot resonant tunneling transistors, which utilized heteroepitaxial spherical Au/Pt nanogap electrodes.

Quasi-phase-matching enabled by van der Waals stacking Open

Yilin Tang, Kabilan Sripathy, Hao Qin, Zhuoyuan Lu, Giovanni Guccione , et al. · 2024

Superconducting diode effect under time-reversal symmetry Open

Fengshuo Liu, Yuki M. Itahashi, S. Aoki, Yuhan Dong, Ziqian Wang , et al. · 2024

In noncentrosymmetric superconductors, superconducting and normal conductions can interchange on the basis of the current flow direction. This effect is termed a superconducting diode effect (SDE), which is a focal point of recent research…

Dimensionality-driven power-law gap in the bilayer TaTe2 grown by molecular-beam epitaxy Open

Bruno Kenichi Saika, Satoshi Yoshida, Markel Pardo‐Almanza, Natsuki Mitsuishi, Masato Sakano , et al. · 2024

Reducing dimensionality can induce profound modifications to the physical properties of a system. In two-dimensional TaS2 and TaSe2, the charge-density wave phase accompanies a Mott transition, thus realizing the strongly correlated insula…

Superconducting diode effect under time reversal symmetry Open

Fengshuo Liu, Yuki M. Itahashi, S. Aoki, Yuhan Dong, Ziqian Wang , et al. · 2024

In noncentrosymmetric superconductors, superconducting and normal conductions can interchange based on the current flow direction. This effect is termed a superconducting diode effect (SDE), which is a focal point of recent research. The b…

Band-driven switching of magnetism in a van der Waals magnetic semimetal Open

Hideki Matsuoka, Shun Kajihara, Takuya Nomoto, Y. H. Wang, Motoaki Hirayama , et al. · 2024

Magnetic semimetals form an attractive class of materials because of the nontrivial contributions of itinerant electrons to magnetism. Because of their relatively low–carrier-density nature, a doping level of those materials could be large…

Giant Modulation of the Second Harmonic Generation by Magnetoelectricity in Two‐Dimensional Multiferroic CuCrP<sub>2</sub>S<sub>6</sub> Open

S. Aoki, Yuhan Dong, Ziqian Wang, Xiang Huang, Yuki M. Itahashi , et al. · 2024

Multiferroic materials have attracted considerable attention owing to their unique magnetoelectric or magnetooptical properties. The recent discovery of few‐layer van der Waals multiferroic crystals provides a new research direction for co…

Electron-doped magnetic Weyl semimetal LixCo3Sn2S2 by bulk-gating Open

Hideki Matsuoka, Yukako Fujishiro, Susumu Minami, Takashi Koretsune, Ryotaro Arita , et al. · 2023

Manipulating carrier density through gate effects, both in electrostatic charge storage and electrochemical intercalation mode, offers powerful control over material properties, although commonly restricted to ultra-thin films or van der W…

Single PbS colloidal quantum dot transistors Open

Kenji Shibata, Masaki Yoshida, Kazuhiko Hirakawa, Tomohiro Otsuka, Satria Zulkarnaen Bisri , et al. · 2023

Colloidal quantum dots are sub-10 nm semiconductors treated with liquid processes, rendering them attractive candidates for single-electron transistors operating at high temperatures. However, there have been few reports on single-electron…

An anisotropic van der Waals dielectric for symmetry engineering in functionalized heterointerfaces Open

Zeya Li, Junwei Huang, Ling Zhou, Zian Xu, Feng Qin , et al. · 2023

Van der Waals dielectrics are fundamental materials for condensed matter physics and advanced electronic applications. Most dielectrics host isotropic structures in crystalline or amorphous forms, and only a few studies have considered the…

Valley-dimensionality locking of superconductivity in cubic phosphides Open

Lingyi Ao, Junwei Huang, Feng Qin, Zeya Li, Toshiya Ideue , et al. · 2023

Two-dimensional superconductivity is primarily realized in atomically thin layers through extreme exfoliation, epitaxial growth, or interfacial gating. Apart from their technical challenges, these approaches lack sufficient control over th…

Berry curvature dipole generation and helicity-to-spin conversion at symmetry-mismatched heterointerfaces Open

Siyu Duan, Feng Qin, Peng Chen, Xupeng Yang, Caiyu Qiu , et al. · 2023

Enabling metallic behaviour in two-dimensional superlattice of semiconductor colloidal quantum dots Open

Ricky Dwi Septianto, Retno Miranti, Tomoka Kikitsu, Takaaki Hikima, Daisuke Hashizume , et al. · 2023

Semiconducting colloidal quantum dots and their assemblies exhibit superior optical properties owing to the quantum confinement effect. Thus, they are attracting tremendous interest from fundamental research to commercial applications. How…

Single PbS colloidal quantum dot transistor Open

Kenji Shibata, Masaki Yoshida, Kazuhiko Hirakawa, Tomohiro Otsuka, Satria Zulkarnaen Bisri , et al. · 2023

Control and understanding of the carrier transport in colloidal quantum dots (CQDs) is crucial for device applications. However, due to the fluctuations in the size and morphology of CQD arrays, characterizing carrier transport has been ch…

Low-temperature phase transition in polar semimetal probed by nonreciprocal transport Open

Yuki M. Itahashi, Yamato Nohara, Toshiya Ideue, Tomoki Akiba, H. Takahashi , et al. · 2023

We studied the nonreciprocal transport of layered MoTe_{2}, which undergoes a structural transition from centrosymmetric to the noncentrosymetric polar phase. Careful inspections of the temperature-dependent resistance showed an occurrence…

Gate-tunable ferromagnetism in a van der Waals magnetic semimetal Open

Hideki Matsuoka, Shun Kajihara, Yue Wang, Yoshihiro Iwasa, Masaki Nakano · 2023

Magnetic semimetals form an attractive class of materials because of the non-trivial contributions of itinerant electrons to magnetism. Due to their relatively low-carrier-density nature, a doping level of those materials could be largely …

Single PbS colloidal quantum dot transistors Open

Kenji Shibata, Masaki Yoshida, Kazuhiko Hirakawa, Tomohiro Otsuka, Satria Zulkarnaen Bisri , et al. · 2023

This is the source data of the manuscript "Single PbS colloidal quantum dot transistors"

An Anisotropic van der Waals Dielectric for Symmetry Engineering in Functionalized Heterointerfaces Open

Zeya Li, Junwei Huang, Ling Zhou, Zian Xu, Feng Qin , et al. · 2023

Source data for "An Anisotropic van der Waals Dielectric for Symmetry Engineering in Functionalized Heterointerfaces"

Vortex dynamics in the two-dimensional BCS-BEC crossover Open

Max Heyl, Kyosuke Adachi, Yuki M. Itahashi, Yuji Nakagawa, Y. Kasahara , et al. · 2022

The Bardeen–Cooper–Schrieffer (BCS) condensation and Bose–Einstein condensation (BEC) are the two limiting ground states of paired Fermion systems, and the crossover between these two limits has been a source of excitement for both fields …

Continuous Electrical Manipulation of Magnetic Anisotropy and Spin Flopping in van der Waals Ferromagnetic Devices Open

Ming Tang, Junwei Huang, Feng Qin, Kun Zhai, Toshiya Ideue , et al. · 2022

Controlling the magnetic anisotropy of ferromagnetic materials plays a key role in magnetic switching devices and spintronic applications. Examples of spin-orbit torque devices with different magnetic anisotropy geometries (in-plane or out…

Signature of topological band crossing in ferromagnetic epitaxial thin film Open

Bruno Kenichi Saika, Satoshi Hamao, Yuki Majima, Xiang Huang, Hideki Matsuoka , et al. · 2022

In intercalated transition metal dichalcogenides (I-TMDCs), transition metal intercalation introduces magnetic phases which in some cases induce topological band crossing. However, evidence of the topological properties remains elusive in …

Signature of topological band crossing in ferromagnetic Cr1/3NbSe2 epitaxial thin film Open

Bruno Kenichi Saika, Satoshi Hamao, Yuki Majima, Xiang Huang, Hideki Matsuoka , et al. · 2022

In intercalated transition metal dichalcogenides (I-TMDC), transition metal intercalation introduces magnetic phases which in some cases induce topological band crossing. However, evidence of the topological properties remains elusive in s…

Spontaneous spin-valley polarization in NbSe2 at a van der Waals interface Open

Hideki Matsuoka, Tetsuro Habe, Yoshihiro Iwasa, Mikito Koshino, Masaki Nakano · 2022

A proximity effect at a van der Waals (vdW) interface enables creation of an emergent quantum electronic ground state. Here we demonstrate that an originally superconducting two-dimensional (2D) NbSe 2 forms a ferromagnetic ground state wi…

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