360 citations · 933 across the 13 of their papers we have counts for
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Energy gap tuning and gate-controlled topological phase transition in InAs/InGaSb composite quantum wells
H. Irie, T. Akiho, F. Couëdo +3
We report transport measurements of strained InAs/InGaSb composite quantum wells (CQWs) in the quantum spin Hall phase, focusing on the control of the energy gap thro…
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…
Impact of epitaxial strain on the topological-nontopological phase diagram and semimetallic behavior of InAs/GaSb composite quantum wells
H. Irie, T. Akiho, F. Couëdo +4
We study the influence of epitaxial strain on the electronic properties of InAs/GaSb composite quantum wells (CQWs), host structures for quantum spin Hall insulators, by transport…
Counterflowing edge current and its equilibration in quantum Hall devices with sharp edge potential: Roles of incompressible strips and contact configuration
T. Akiho, H. Irie, K. Onomitsu +1
We report the observation of counterflowing edge current in InAs quantum wells which leads to the breakdown of quantum Hall (QH) effects at high magnetic fields. Counterflowing edg…
Pseudospin Berry phase as a signature of nontrivial band topology in a two-dimensional system
F. Couëdo, H. Irie, T. Akiho +3
Electron motion in crystals is governed by the coupling between crystal momentum and internal degrees of freedom such as spin implicit in the band structure. The description of thi…
Broadband reconfigurable logic gates in phonon waveguides
Daiki Hatanaka, Tom Darras, Imran Mahboob +2
The high-quality-factor mechanical resonator in electromechanical systems has facilitated dynamic control of phonons via parametric nonlinear processes and paved the development of…
Engineering quantum spin Hall insulators by strained-layer heterostructures
Takafumi Akiho, François Couëdo, Hiroshi Irie +3
Quantum spin Hall insulators (QSHIs), also known as two-dimensional topological insulators, have emerged as an unconventional class of quantum states with insulating bulk and condu…
Single-edge transport in an InAs/GaSb quantum spin Hall insulator
François Couëdo, Hiroshi Irie, Kyoichi Suzuki +2
We report transport measurements in a single edge channel of an InAs/GaSb quantum spin Hall insulator, where the conduction occurs through only one pair of counterpropagating edge…
Gate-controlled semimetal-topological insulator transition in an InAs/GaSb heterostructure
Kyoichi Suzuki, Yuichi Harada, Koji Onomitsu +1
We report a gate-controlled transition of a semimetallic InAs/GaSb heterostructure to a topological insulator. The transition is induced by decreasing the degree of band inversion…
Phonon propagation dynamics in band-engineered one-dimensional phononic crystal waveguides
Daiki Hatanaka, Amaury Dodel, Imran Mahboob +2
The phonon propagation dynamics in a phononic crystal waveguide, realized via a suspended one-dimensional membrane array with periodic air holes, is investigated as function of its…
Two-mode squeezing in an electromechanical resonator
I. Mahboob, H. Okamoto, K. Onomitsu +1
The widespread availability of quantum entanglement with photons, in the guise of two-mode squeezed states, can be attributed to the phenomenon of parametric down-conversion. A rei…
Phononic crystal waveguides for electromechanical circuits
Daiki Hatanaka, Imran Mahboob, Koji Onomitsu +1
Nanoelectromechanical systems (NEMS), utilising localised mechanical vibrations, were pioneered for sensors, signal processors and to study macroscopic quantum mechanics. Increasin…
Edge Channel Transport in InAs/GaSb Topological Insulating Phase
Kyoichi Suzuki, Yuichi Harada, Koji Onomitsu +1
Transport in InAs/GaSb heterostructures with different InAs layer thicknesses is studied using a six-terminal Hall bar geometry with a 2-m edge channel length. For a sample with…
Coherent phonon manipulation in coupled mechanical resonators
Hajime Okamoto, Adrien Gourgout, Chia-Yuan Chang +4
Coupled mechanical oscillations were first observed in paired pendulum clocks in the mid-seventeenth century and were extensively studied for their novel sympathetic oscillation dy…