Kazuhiko Hirakawa
Kazuhiko Hirakawa
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Interface roughness scattering in GaAs/AlAs quantum wells
H Sakaki, T Noda, K Hirakawa, M Tanaka, T Matsusue
Applied physics letters 51 (23), 1934-1936, 1987
Mobility of the two-dimensional electron gas at selectively doped n-type Al x Ga 1− x As/GaAs heterojunctions with controlled electron concentrations
K Hirakawa, H Sakaki
Physical Review B 33 (12), 8291, 1986
Intrinsic electron accumulation layers on reconstructed clean InAs (100) surfaces
M Noguchi, K Hirakawa, T Ikoma
Physical review letters 66 (17), 2243, 1991
Bound-to-continuum intersubband photoconductivity of self-assembled InAs quantum dots in modulation-doped heterostructures
SW Lee, K Hirakawa, Y Shimada
Applied Physics Letters 75 (10), 1428-1430, 1999
Tunneling spectroscopy of Andreev energy levels in a quantum dot coupled to a superconductor
RS Deacon, Y Tanaka, A Oiwa, R Sakano, K Yoshida, K Shibata, ...
Physical review letters 104 (7), 076805, 2010
Energy relaxation of two‐dimensional electrons and the deformation potential constant in selectively doped AlGaAs/GaAs heterojunctions
K Hirakawa, H Sakaki
Applied physics letters 49 (14), 889-891, 1986
Fabrication of graphene nanoribbon by local anodic oxidation lithography using atomic force microscope
S Masubuchi, M Ono, K Yoshida, K Hirakawa, T Machida
Applied Physics Letters 94 (8), 2009
Single-photon detector in the microwave range
O Astafiev, S Komiyama, T Kutsuwa, V Antonov, Y Kawaguchi, ...
Applied physics letters 80 (22), 4250-4252, 2002
MEMS reconfigurable metamaterial for terahertz switchable filter and modulator
Z Han, K Kohno, H Fujita, K Hirakawa, H Toshiyoshi
Optics Express 22 (18), 21326-21339, 2014
Machine-learning-optimized aperiodic superlattice minimizes coherent phonon heat conduction
R Hu, S Iwamoto, L Feng, S Ju, S Hu, M Ohnishi, N Nagai, K Hirakawa, ...
Physical Review X 10 (2), 021050, 2020
Far‐infrared emission spectroscopy of hot two‐dimensional plasmons in Al0.3Ga0.7As/GaAs heterojunctions
K Hirakawa, K Yamanaka, M Grayson, DC Tsui
Applied physics letters 67 (16), 2326-2328, 1995
Dispersive terahertz gain of a nonclassical oscillator: Bloch oscillation in semiconductor superlattices
N Sekine, K Hirakawa
Physical review letters 94 (5), 057408, 2005
Kondo universal scaling for a quantum dot coupled to superconducting leads
C Buizert, A Oiwa, K Shibata, K Hirakawa, S Tarucha
Physical review letters 99 (13), 136806, 2007
Mobility modulation of the two-dimensional electron gas via controlled deformation of the electron wave function in selectively doped AlGaAs-GaAs heterojunctions
K Hirakawa, H Sakaki, J Yoshino
Physical review letters 54 (12), 1279, 1985
Charge-sensitive infrared phototransistors: Characterization by an all-cryogenic spectrometer
T Ueda, Z An, K Hirakawa, S Komiyama
Journal of Applied Physics 103 (9), 2008
Terahertz conductivity and possible Bloch gain in semiconductor superlattices
Y Shimada, K Hirakawa, M Odnoblioudov, KA Chao
Physical review letters 90 (4), 046806, 2003
Phase coherence length of electron waves in narrow AlGaAs/GaAs quantum wires fabricated by focused ion beam implantation
T Hiramoto, K Hirakawa, Y Iye, T Ikoma
Applied physics letters 54 (21), 2103-2105, 1989
Concentration of electrons in selectively doped GaAlAs/GaAs heterojunction and its dependence on spacer‐layer thickness and gate electric field
K Hirakawa, H Sakaki, J Yoshino
Applied physics letters 45 (3), 253-255, 1984
Gate-Tunable Large Negative Tunnel Magnetoresistance in Ni–C60–Ni Single Molecule Transistors
K Yoshida, I Hamada, S Sakata, A Umeno, M Tsukada, K Hirakawa
Nano letters 13 (2), 481-485, 2013
Spin transport through a single self-assembled InAs quantum dot with ferromagnetic leads
K Hamaya, S Masubuchi, M Kawamura, T Machida, M Jung, K Shibata, ...
Applied physics letters 90 (5), 053108, 2007
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