18 citations · 28 across the 3 of their papers we have counts for
5 papers
Suppression of Gate Screening on Edge Magnetoplasmons by Highly Resistive ZnO Gate
N. Kumada, N. -H. Tu, K. -i. Sasaki +5
We investigate a way to suppress high-frequency coupling between a gate and low-dimensional electron systems in the gigahertz range by measuring the velocity of edge magnetoplasmon…
Active spatial control of terahertz graphene plasmons by tailoring carrier density profile
Ngoc Han Tu, Katsumasa Yoshioka, Satoshi Sasaki +3
Graphene offers a possibility for actively controlling plasmon confinement and propagation by tailoring its spatial conductivity pattern. However, implementation of this concept ha…
Coupling between Quantum Hall Edge Channels on Opposite Sides of a Hall Bar
Ngoc Han Tu, Masayuki Hashisaka, Takeshi Ota +4
We investigate the coupling between quantum Hall (QH) edge channels (ECs) located at opposite sides of a 50-um-wide Hall bar by exciting a charged wavepacket in one EC and detectin…
Plasmon Confinement by Carrier Density Modulation in Graphene
Ngoc Han Tu, Makoto Takamura, Yui Ogawa +2
We investigate plasmon resonances in graphene with periodic carrier density modulation. The period is 8 um, and each period consists of 1.7- and 6.3-um-wide ribbons with different…
Charge Fractionalization in Artificial Tomonaga-Luttinger Liquids with Controlled Interaction Strength
Paul Brasseur, Ngoc Han Tu, Yoshiaki Sekine +4
We investigate charge fractionalizations in artificial Tomonaga-Luttinger liquids (TLLs) composed of two capacitively coupled quantum Hall edge channels (ECs) in graphene. The inte…