79 citations · 167 across the 12 of their papers we have counts for
12 papers
Band-selective Plasmonic Polaron in Thermoelectric Semimetal TaPdSe with ultra-high power factor
Daiki Ootsuki, Akitoshi Nakano, Urara Maruoka +6
We report the electronic structure of the thermoelectric semimetal TaPdSe with a large thermoelectric power factor and giant Peltier conductivity by means of angle-resolved…
Current-induced successive structural phase transitions beyond thermal equilibrium in single-crystal VO2
Shunsuke Kitou, Akitoshi Nakano, Masato Imaizumi +5
Nonequilibrium systems driven by external energy sources host unexplored physics; yet phase transitions beyond thermal equilibrium remain elusive. Here, we demonstrate that electri…
Current-induced Nonequilibrium Phase Transition Accompanied by Giant Gap Reduction in Vanadium Dioxide
Akitoshi Nakano, Masato Imaizumi, Ichiro Terasaki
We investigated nonlinear conduction in bulk single crystals of VO2 with precise temperature control. Two distinct nonequilibrium phenomena were identified: a gradual reduction of…
Pressure-induced anomalous enhancement in superconducting critical temperature of transition-metal chalcogenide TaPdS and TaPdSe
Ryo Matsumoto, Akitoshi Nakano, Takafumi D Yamamoto +5
The emergence of a second dome in the superconducting phase through pressure-driven manipulation of crystal structures in materials has attracted considerable attention. Transition…
Molecular orbital formation and metastable short-range ordered structure in VO
Shunsuke Kitou, Akitoshi Nakano, Masato Imaizumi +3
The metal-insulator transition (MIT) in vanadium dioxide VO due to V-V dimerization has been extensively discussed for decades. While it is widely acknowledged that electron co…
Melting of excitonic insulator phase by an intense terahertz pulse in TaNiSe
Naoki Takamura, Tatsuya Miyamoto, Ryohei Ikeda +9
In this study, the optical response to a terahertz pulse was investigated in the transition metal chalcogenide TaNiSe, a candidate excitonic insulator. First, by irradiatin…
Giant Peltier Conductivity in an Uncompensated Semimetal Ta2PdSe6
Akitoshi Nakano, Ai Yamakage, Urara Maruoka +3
Thermoelectric properties of single crystal Ta2PdSe6 is investigated by means of transport measurements, and a density functional calculation. We found a giant Peltier conductivity…
Hybridization-gap Formation and Superconductivity in the Pressure-induced Semimetallic Phase of the Excitonic Insulator TaNiSe
Kazuyuki Matsubayashi, Hidekazu Okamura, Takashi Mizokawa +19
The excitonic insulator TaNiSe experiences a first-order structural transition under pressure from rippled to flat layer-structure at Ps = 3 GPa, which drives the system fr…
Room Temperature Thermoelectric Properties of Isostructural Selenides Ta2PdS6 and Ta2PdSe6
Akitoshi Nakano, Urara Maruoka, Fumiaki Kato +2
We have measured thermoelectric properties of Ta2PdX6 (X=S, Se) around room temperature using single crystal samples. We find that the power factor of Ta2PdX6 is relatively high fr…
Weak Ferroelectricity in n = 2 pseudo Ruddlesden-Popper-type niobate Li2SrNb2O7
Takayuki Nagai, Hirokazu Shirakuni, Akitoshi Nakano +4
Li2SrNb2O7 (LSNO) crystallizes in a structure closely related to n = 2 Ruddlesden-Popper-type compounds, which is gen-erally formed by intergrowth of 2-dimensional perovskite-type…
Effect of Cu intercalation and pressure on excitonic interaction in 1T-TiSe2
Shunsuke Kitou, Akitoshi Nakano, Shintaro Kobayashi +9
1T-TiSe2 has a semimetallic band structure at room temperature and undergoes phase transition to a triple-q charge density wave (CDW) state with a commensurate superlattice structu…
Electron-Phonon Coupling Mode in Excitonic Insulator
Akitoshi Nakano, Takumi Hasegawa, Shinya Tamura +3
Ta2NiSe5 is considered a promising excitonic insulator (EI) candidate with slight phonon contributions, since it exhibits a tiny orthorhombic-to-monoclinic structural distortion at…