Zobrazeno 1 - 10
of 580
pro vyhledávání: '"Ueno, Keiji"'
The remarkable properties of (1T-)TiSe$_2$ among the transition metal dichalcogenides have attracted the attention of many researchers due to its peculiar behavior during the charge density wave (CDW) transition. Therefore, it is highly desirable to
Externí odkaz:
http://arxiv.org/abs/2402.04664
We investigate the ultrafast lattice dynamics in ${1T-TiSe_2}$ using femtosecond reflection pump-probe and pump-pump-probe techniques at room temperature. The time-domain signals and Fourier-transformed spectra show the $A_{1g}$ phonon mode at 5.9 TH
Externí odkaz:
http://arxiv.org/abs/2306.05777
Autor:
Afalla, Jessica, Muldera, Joselito, Takamizawa, Semmi, Fukuda, Takumi, Ueno, Keiji, Tani, Masahiko, Hase, Muneaki
Publikováno v:
J. Appl. Phys. 133, 165103 (2023)
Terahertz (THz) time-domain emission spectroscopy was performed on layered 2H-MoSe2 and 2H-WSe2. The THz emission shows an initial cycle attributed to surge currents and is followed by oscillations attributed to coherent interlayer phonon modes. To o
Externí odkaz:
http://arxiv.org/abs/2305.18805
Autor:
Lin, Kenneth, Prasad, Nitin, Burg, G. William, Zou, Bo, Ueno, Keiji, Watanabe, Kenji, Taniguchi, Takashi, MacDonald, Allan H., Tutuc, Emanuel
We report enhanced interlayer tunneling with reduced linewidth at zero interlayer bias in a twist-controlled double monolayer graphene heterostructure in the quantum Hall regime, when the top ($\nu_{\mathrm{T}}$) and bottom ($\nu_{\mathrm{B}}$) layer
Externí odkaz:
http://arxiv.org/abs/2206.11799
Autor:
Hagiwara, Kenta, Rüßmann, Philipp, Tan, Xin Liang, Chen, Ying-Jiun, Ueno, Keiji, Feyer, Vitaliy, Zamborlini, Giovanni, Jugovac, Matteo, Suga, Shigemasa, Blügel, Stefan, Schneider, Claus Michael, Tusche, Christian
Topological semimetals have recently attracted great attention due to prospective applications governed by their peculiar Fermi surfaces. Weyl semimetals host chiral fermions that manifest as pairs of non-degenerate massless Weyl points in their elec
Externí odkaz:
http://arxiv.org/abs/2205.15252
Autor:
Fukuda, Takumi, Kaburauchi, Ryota, Saito, Yuta, Makino, Kotaro, Fons, Paul, Ueno, Keiji, Hase, Muneaki
We report on the coherent phonon spectroscopy of polymorphic $\mathrm{MoTe_2}$ single crystals using a femtosecond-pulsed laser to investigate the relationship between structural phase transitions and photo-thermal effects induced by high-density las
Externí odkaz:
http://arxiv.org/abs/2201.03337
Autor:
Sasaki, Taro, Ueno, Keiji, Taniguchi, Takashi, Watanabe, Kenji, Nishimura, Tomonori, Nagashio, Kosuke
Publikováno v:
small, 2020, 16, 2004907
The memory window of floating gate (FG) type non-volatile memory (NVM) devices is a fundamental figure of merit used not only to evaluate the performance, such as retention and endurance, but also to discuss the feasibility of advanced functional mem
Externí odkaz:
http://arxiv.org/abs/2012.01155
Autor:
Nakamura, Keigo, Nagamura, Naoka, Ueno, Keiji, Taniguchi, Takashi, Watanabe, Kenji, Nagashio, Kosuke
Publikováno v:
ACS Applied Materials and Interfaces, 2020, 12, 51598
Van der Waals heterostructures are the ideal material platform for tunnel field effect transistors (TFETs) because a band-to-band tunneling (BTBT) dominant current is feasible at room temperature (RT) due to ideal, dangling bond free heterointerfaces
Externí odkaz:
http://arxiv.org/abs/2012.01146
Autor:
Choi, Junho, Florian, Matthias, Steinhoff, Alexander, Erben, Daniel, Tran, Kha, Kim, Dong Seob, Sun, Liuyang, Quan, Jiamin, Claassen, Robert, Majumder, Somak, Hollingsworth, Jennifer A., Taniguchi, Takashi, Watanabe, Kenji, Ueno, Keiji, Singh, Akshay, Moody, Galan, Jahnke, Frank, Li, Xiaoqin
Publikováno v:
Phys. Rev. Lett. 126, 047401 (2021)
In van der Waals (vdW) heterostructures formed by stacking two monolayers of transition metal dichalcogenides, multiple exciton resonances with highly tunable properties are formed and subject to both vertical and lateral confinement. We investigate
Externí odkaz:
http://arxiv.org/abs/2007.15196
Autor:
Sakanashi, Kohei, Ouchi, Hidemitsu, Kamiya, Kota, Krüger, Peter, Miyamoto, Katsuhiko, Omatsu, Takashige, Ueno, Keiji, Watanabe, Kenji, Taniguchi, Takashi, Bird, Jonathan P., Aoki, Nobuyuki
Publikováno v:
Nanotechnology, 31, 205205 (2020)
Although semiconductor to metal phase transformation of MoTe$_{2}$ by high-density laser irradiation of more than 0.3 MW/cm$^{2}$ has been reported, we reveal that the laser-induced-metal (LIM) phase is not the 1T' structure derived by a polymorphic-
Externí odkaz:
http://arxiv.org/abs/2001.07860