Search Results for author: Kenji Watanabe

Found 23 papers, 3 papers with code

Long Phonon Mean Free Paths Observed in Cross-plane Thermal-Conductivity Measurements of Exfoliated Hexagonal Boron Nitride

no code implementations12 Mar 2021 Gabriel R. Jaffe, Keenan J. Smith, Kenji Watanabe, Takashi Taniguchi, Max G. Lagally, Mark A. Eriksson, Victor W. Brar

We measure a forty-fold increase in the cross-plane thermal conductivity between 7 nm and 585 nm flakes at 295 K. We attribute the large increase in thermal conductivity with increasing thickness to contributions from phonons with long mean free paths (MFPs), spanning many hundreds of nanometers in the thickest flakes.

Materials Science Mesoscale and Nanoscale Physics

Open-cavity in closed-cycle cryostat as a quantum optics platform

no code implementations9 Mar 2021 Samarth Vadia, Johannes Scherzer, Holger Thierschmann, Clemens Schäfermeier, Claudio Dal Savio, Takashi Taniguchi, Kenji Watanabe, David Hunger, Khaled Karraï, Alexander Högele

The introduction of an optical resonator can enable efficient and precise interaction between a photon and a solid-state emitter.

Quantum Physics Mesoscale and Nanoscale Physics Instrumentation and Detectors Optics

Spin-valley coupling in single-electron bilayer graphene quantum dots

no code implementations8 Mar 2021 Luca Banszerus, Samuel Möller, Corinne Steiner, Eike Icking, Stefan Trellenkamp, Florian Lentz, Kenji Watanabe, Takashi Taniguchi, Christian Volk, Christoph Stampfer

Understanding how the electron spin is coupled to orbital degrees of freedom, such as a valley degree of freedom in solid-state systems is central to applications in spin-based electronics and quantum computation.

Mesoscale and Nanoscale Physics

Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe$_2$

no code implementations24 Feb 2021 Piotr Kapuscinski, Alex Delhomme, Diana Vaclavkova, Artur Slobodeniuk, Magdalena Grzeszczyk, Miroslav Bartos, Kenji Watanabe, Takashi Taniguchi, Clément Faugeras, Marek Potemski

The comparison of energy ladders of bright and dark Rydberg excitons is shown to be a method to experimentally evaluate one of the missing band parameters in TMD monolayers: the amplitude of the spin-orbit splitting of the conduction band.

Mesoscale and Nanoscale Physics

Tunable ferroelectricity in hBN intercalated twisted double-layer graphene

no code implementations24 Feb 2021 Yibo Wang, Siqi Jiang, Jingkuan Xiao, Xiaofan Cai, Di Zhang, Ping Wang, Guodong Ma, Yaqing Han, Jiabei Huang, Kenji Watanabe, Takashi Taniguchi, Alexander S. Mayorov, Geliang Yu

Van der Waals (vdW) assembly of two-dimensional materials has been long recognized as a powerful tool to create unique systems with properties that cannot be found in natural compounds.

Mesoscale and Nanoscale Physics Materials Science

High-Mobility p-Channel Wide Bandgap Transistors Based on h-BN/Diamond Heterostructures

no code implementations11 Feb 2021 Yosuke Sasama, Taisuke Kageura, Masataka Imura, Kenji Watanabe, Takashi Taniguchi, Takashi Uchihashi, Yamaguchi Takahide

Field-effect transistors made of wide-bandgap semiconductors can operate at high voltages, temperatures and frequencies with low energy losses, and have been of increasing importance in power and high-frequency electronics.

Materials Science Mesoscale and Nanoscale Physics

Nanoscale modification of WS$_2$ trion emission by its local electromagnetic environment

no code implementations11 Feb 2021 Noémie Bonnet, Hae Yeon Lee, Fuhui Shao, Steffi Y. Woo, Jean-Denis Blazit, Kenji Watanabe, Takashi Taniguchi, Alberto Zobelli, Odile Stéphan, Mathieu Kociak, Silvija Gradecak-Garaj, Luiz H. G. Tizei

Structural, electronic, and chemical nanoscale modifications of transition metal dichalcogenide monolayers alter their optical properties, including the generation of single photon emitters.

Mesoscale and Nanoscale Physics

Strong-Magnetic-Field Magnon Transport in Monolayer Graphene

no code implementations1 Feb 2021 Haoxin Zhou, Chunli Huang, Nemin Wei, Takashi Taniguchi, Kenji Watanabe, Michael P. Zaletel, Zlatko Papić, Allan H. MacDonald, Andrea F. Young

Recent experiments have observed an even denominator fractional quantum Hall state thought to be associated with a transition in the underlying isospin order from a spin-singlet charge density wave at low magnetic fields to an antiferromagnet at high magnetic fields, implying that a similar transition must occur at charge neutrality.

Mesoscale and Nanoscale Physics Strongly Correlated Electrons

Moiré-trapped interlayer trions in a charge-tunable WSe$_2$/MoSe$_2$ heterobilayer

no code implementations19 Jan 2021 Mauro Brotons-Gisbert, Hyeonjun Baek, Aidan Campbell, Kenji Watanabe, Takashi Taniguchi, Brian D. Gerardot

However, the narrow emission linewidths of the quantum emitters contrast with a broad ensemble IX emission observed in nominally identical heterobilayers, opening a debate regarding the origin of IX emission.

Mesoscale and Nanoscale Physics

Competing correlated states and abundant orbital magnetism in twisted monolayer-bilayer graphene

no code implementations11 Jan 2021 Minhao He, Ya-Hui Zhang, Yuhao Li, Zaiyao Fei, Kenji Watanabe, Takashi Taniguchi, Xiaodong Xu, Matthew Yankowitz

Flat band moir\'e superlattices have recently emerged as unique platforms for investigating the interplay between strong electronic correlations, nontrivial band topology, and multiple isospin 'flavor' symmetries.

Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science

Counterintuitive gate dependence of weak antilocalization in bilayer graphene/WSe$_2$ heterostructures

no code implementations10 Dec 2020 Julia Amann, Tobias Völkl, Denis Kochan, Kenji Watanabe, Takashi Taniguchi, Jaroslav Fabian, Dieter Weiss, Jonathan Eroms

Strong gate control of proximity-induced spin-orbit coupling was recently predicted in bilayer graphene/transition metal dichalcogenides (BLG/TMDC) heterostructures, as charge carriers can easily be shifted between the two graphene layers, and only one of them is in close contact to the TMDC.

Mesoscale and Nanoscale Physics

Electric field tunable unconventional superconductivity in alternating twist magic-angle trilayer graphene

no code implementations4 Dec 2020 Zeyu Hao, A. M. Zimmerman, Patrick Ledwith, Eslam Khalaf, Danial Haie Najafabadi, Kenji Watanabe, Takashi Taniguchi, Ashvin Vishwanath, Philip Kim

We construct a van der Waals heterostructure consisting of three graphene layers stacked with alternating twisting angles $\pm\theta$.

Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons

Minigap and Andreev bound states in ballistic graphene

no code implementations23 Nov 2020 Luca Banszerus, Florian Libisch, Andrea Ceruti, Stefan Blien, Kenji Watanabe, Takashi Taniguchi, Andreas K. Hüttel, Bernd Beschoten, Fabian Hassler, Christoph Stampfer

A finite-size normal conductor, proximity-coupled to a superconductor has been predicted to exhibit a so-called minigap, in which quasiparticle excitations are prohibited.

Mesoscale and Nanoscale Physics Superconductivity

Single- and narrow-line photoluminescence in a boron nitride-supported MoSe$_2$/graphene heterostructure

no code implementations5 Nov 2020 Luis E. Parra López, Loïc Moczko, Joanna Wolff, Aditya Singh, Etienne Lorchat, Michelangelo Romeo, Takashi Taniguchi, Kenji Watanabe, Stéphane Berciaud

Since this exciton has a picosecond radiative lifetime at low temperature, comparable with the energy transfer time, its low-temperature photoluminescence is only quenched by a factor of $3. 3 \pm 1$ and $4. 4 \pm 1$ in the presence of mono- and bilayer graphene, respectively.

Mesoscale and Nanoscale Physics Materials Science

Landau Quantization and Highly Mobile Fermions in an Insulator

no code implementations12 Oct 2020 Pengjie Wang, Guo Yu, Yanyu Jia, Michael Onyszczak, F. Alexandre Cevallos, Shiming Lei, Sebastian Klemenz, Kenji Watanabe, Takashi Taniguchi, Robert J. Cava, Leslie M. Schoop, Sanfeng Wu

Using a detection scheme that avoids edge contributions, we uncover strikingly large quantum oscillations in the monolayer insulator's magnetoresistance, with an onset field as small as ~ 0. 5 tesla.

Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons

Emergence of Chern insulating states in non-Magic angle twisted bilayer graphene

no code implementations8 Oct 2020 Cheng Shen, Jianghua Ying, Le Liu, Jianpeng Liu, Na Li, Shuopei Wang, Jian Tang, Yanchong Zhao, Yanbang Chu, Kenji Watanabe, Takashi Taniguchi, Rong Yang, Dongxia Shi, Fanming Qu, Li Lu, Wei Yang, Guangyu Zhang

For {\theta}=1. 25{\deg}, we observe an emergence of topological insulating states at hole side with a sequence of Chern number |C|=4-|v|, where v is the number of electrons (holes) in moir\'e unite cell.

Mesoscale and Nanoscale Physics Materials Science

Tunnel field-effect transistors for sensitive terahertz detection

no code implementations6 Oct 2020 Igor Gayduchenko, Shuigang Xu, Georgy Alymov, Maxim Moskotin, Ivan Tretyakov, Takashi Taniguchi, Kenji Watanabe, Gregory Goltsman, Andre K. Geim, Georgy Fedorov, Dmitry Svintsov, Denis A. Bandurin

The rectification of electromagnetic waves to direct currents is a crucial process for energy harvesting, beyond-5G wireless communications, ultra-fast science, and observational astronomy.

Mesoscale and Nanoscale Physics

Optical signatures of charge order in a Mott-Wigner state

no code implementations10 Aug 2020 Yuya Shimazaki, Clemens Kuhlenkamp, Ido Schwartz, Tomasz Smolenski, Kenji Watanabe, Takashi Taniguchi, Martin Kroner, Richard Schmidt, Michael Knap, Atac Imamoglu

The elementary optical excitations in two dimensional semiconductors hosting itinerant electrons are attractive and repulsive polarons -- excitons that are dynamically screened by electrons.

Mesoscale and Nanoscale Physics Strongly Correlated Electrons

Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires

1 code implementation5 Jul 2018 Jouri D. S. Bommer, Hao Zhang, Önder Gül, Bas Nijholt, Michael Wimmer, Filipp N. Rybakov, Julien Garaud, Donjan Rodic, Egor Babaev, Matthias Troyer, Diana Car, Sébastien R. Plissard, Erik P. A. M. Bakkers, Kenji Watanabe, Takashi Taniguchi, Leo P. Kouwenhoven

Spin-orbit interaction (SOI) plays a key role in creating Majorana zero modes in semiconductor nanowires proximity coupled to a superconductor.

Mesoscale and Nanoscale Physics

A Stochastic Temporal Model of Polyphonic MIDI Performance with Ornaments

1 code implementation8 Apr 2014 Eita Nakamura, Nobutaka Ono, Shigeki Sagayama, Kenji Watanabe

We study indeterminacies in realization of ornaments and how they can be incorporated in a stochastic performance model applicable for music information processing such as score-performance matching.

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