44 citations · 333 across the 15 of their papers we have counts for
15 papers
Photo-Induced Ultrafast Symmetry Switch in SnSe
Yadong Han, Junhong Yu, Hang Zhang +8
Layered tin selenide (SnSe) has recently emerged as a high-performance thermoelectric material with the current record for the figure of merit (ZT) observed in the high-temperature…
Coherent control of 40-THz optical phonons in diamond using femtosecond optical pulses
Tetsuya Kimata, Kazuma Yoda, Hana Matsumoto +4
Coherent control is an optical technique to manipulate quantum states of matter. The coherent control of 40-THz optical phonons in diamond was demonstrated by using a pair of sub-1…
Ultrafast Quantum-path Interferometry Revealing the Generation Process of Coherent Phonons
Kazutaka G. Nakamura, Kensuke Yokota, Yuki Okuda +5
Optical dual-pulse pumping actively creates quantum-mechanical superposition of the electronic and phononic states in a bulk solid. We here made transient reflectivity measurements…
Temperature effect on the coupling between coherent longitudinal phonons and plasmons in n- and p-type GaAs
Jianbo Hu, Hang Zhang, Yi Sun +2
The coupling between longitudinal optical (LO) phonons and plasmons plays a fundamental role in determining the performance of doped semiconductor devices. In this work, we report…
Femtosecond study of A1g phonons in the strong 3D topological insulators: From pump-probe to coherent control
Jianbo Hu, Kyushiro Igarashi, Takao Sasagawa +2
Fully symmetric A1g phonons are expected to play a dominant role in electron scattering in strong topological insulators (TIs), thus limiting the ballistic transport of future elec…
Coherent control theory and experiment of optical phonons in diamond
Hiroya Sasaki, Riho Tanaka, Yasuaki Okano +4
The coherent control of optical phonons has been experimentally demonstrated in various physical systems. While the transient dynamics for optical phonons can be explained by pheno…
Spectrally resolved detection in transient-reflectivity measurements of coherent optical phonons in diamond
Kazutaka G. Nakamura, Kazuma Ohya, Hiroshi Takahashi +7
Coherent optical phonons in bulk solid system play a crucial role in understanding and designing light-matter interactions and can be detected by the transient-reflectivity measure…
Influence of pulse width and detuning on coherent phonon generation
Kazutaka G. Nakamura, Yutaka Shikano, Yosuke Kayanuma
We investigated the coherent phonon generation mechanism by irradiation of an ultrashort pulse with a simple two-level model. Our derived formulation shows that both impulsive stim…
Complex structural dynamics of bismuth under laser-driven compression
Jianbo Hu, Kouhei Ichiyanagi, Tomoaki Doki +13
With the aid of nanosecond time-resolved X-ray diffraction techniques, we have explored the complex structural dynamics of bismuth under laser-driven compression. The results demon…
Reversible phase transition in laser-shocked 3Y-TZP ceramics observed via nanosecond time-resolved X-ray diffraction
Jianbo Hu, Kouhei Ichiyanagi, Hiroshi Takahashi +8
The high-pressure phase stability of the metastable tetragonal zirconia is still under debate. The transition dynamics of shocked Y2O3 (3 mol%) stabilized tetragonal zirconia ceram…
Delayed formation of coherent LO phonon-plasmon coupled modes in n-type and p-type GaAs measured using a femtosecond coherent control technique
Jianbo Hu, Oleg V. Misochko, Arihiro Goto +1
Coherent control experiments using a pair of collinear femtosecond laser pulses have been carried out to manipulate longitudinal optical (LO) phonon-plasmon coupled (LOPC) modes in…
Direct observation of two-phonon bound states in ZnTe
Jianbo Hu, Oleg V. Misochko, Kazutaka G. Nakamura
A coherent two-phonon bound state has been impulsively generated in ZnTe(110) via second-order Raman scattering in the time domain for the first time. The two-phonon bound state, c…
Controlling phonon squeezing and correlation via one- and two-phonon interference
Oleg V. Misochko, Jianbo Hu, Kazutaka G. Nakamura
When ultrafast laser pulse strikes the crystal with a van Hove singularity in the phonon density of states, it can create a pair of anti-correlated in wave-vector acoustic phonons.…
Statistical mechanics of typical set decoding
Yoshiyuki Kabashima, Kazutaka Nakamura, Jort van Mourik
The performance of ``typical set (pairs) decoding'' for ensembles of Gallager's linear code is investigated using statistical physics. In this decoding, error happens when the info…
Statistical Mechanics of Low-Density Parity Check Error-Correcting Codes over Galois Fields
Kazutaka Nakamura, Yoshiyuki Kabashima, David Saad
A variation of low density parity check (LDPC) error correcting codes defined over Galois fields () is investigated using statistical physics. A code of this type is charact…