111 citations · 203 across the 9 of their papers we have counts for
10 papers
Tellurium trioxide as an n-type wide-gap semiconductor with ultrahigh work functions from first principles
Tianwei Wang, Teruya Nagafuji, Kota Hanzawa +2
The exploration of next-generation wide-gap semiconductors with extreme work functions is highly desirable for the continued advancement of electronic and optoelectronic devices. B…
Nonreciprocal charge transport in an iron-based superconductor with broken inversion symmetry engineered by a hydrogen-concentration gradient
Takayuki Nagai, Yukito Nishio, Jumpei Matsumoto +4
The breaking of spatial inversion symmetry in condensed matter gives rise to intriguing physical properties, such as ferroelectricity, piezoelectricity, spin-momentum locking, and…
High upper critical field (120 T) with small anisotropy of highly hydrogen-substituted SmFeAsO epitaxial film
Kota Hanzawa, Jumpei Matsumoto, Soshi Iimura +3
The electronic transport properties of a highly hydrogen-substituted 1111-type SmFeAsO epitaxial film with high critical-temperature (Tc = 45 K) were investigated under high magnet…
Fully automated spectroscopic ellipsometry analyses of crystalline-phase semiconductors based on a new algorithm
Sara Maeda, Kohei Oiwake, Yukinori Nishigaki +8
One significant drawback of a spectroscopic ellipsometry (SE) technique is its time-consuming and often complicated analysis procedure necessary to assess the optical functions of…
Heteroepitaxial Thin-Film Growth of a Ternary Nitride Semiconductor CaZn2N2
Masatake Tsuji, Kota Hanzawa, Hiroyuki Kinjo +2
Zinc-based nitride CaZn2N2 films grown by molecular beam epitaxy (MBE) with a plasma-assisted active nitrogen-radical source are promising candidates of next-generation semiconduct…
Stabilization and heteroepitaxial growth of metastable tetragonal FeS thin films by pulsed laser deposition
Kota Hanzawa, Masato Sasase, Hidenori Hiramatsu +1
Pulsed laser deposition, a non-equilibrium thin-film growth technique, was used to stabilize metastable tetragonal iron sulfide (FeS), the bulk state of which is known as a superco…
Superconductivity at 48 K of heavily hydrogen-doped SmFeAsO epitaxial films grown by topotactic chemical reaction using CaH2
Jumpei Matsumoto, Kota Hanzawa, Masato Sasase +4
High-critical-temperature (Tc) superconductivity at 48 K is reported for hydrogen-doped SmFeAsO epitaxial films on MgO single-crystal substrates. The key processes are pulsed laser…
Particulate Generation on Surface of Iron Selenide Films by Air Exposure
Hidenori Hiramatsu, Kota Hanzawa, Toshio Kamiya +1
Nanometer-sized particular structures are generated on the surfaces of FeSe epitaxial films directly after exposure to air; this phenomenon was studied in the current work because…
Insulator-like behavior coexisting with metallic electronic structure in strained FeSe thin films grown by molecular beam epitaxy
Kota Hanzawa, Yuta Yamaguchi, Yukiko Obata +4
This paper reports that ~10-nm-thick FeSe thin films exhibit insulator-like behavior in terms of the temperature dependence of their electrical resistivity even though bulk FeSe ha…
Electric field-induced superconducting transition of insulating FeSe thin film at 35 K
Kota Hanzawa, Hikaru Sato, Hidenori Hiramatsu +2
It is thought that strong electron correlation in an insulating parent phase would enhance a critical temperature (Tc) of superconductivity in a doped phase via enhancement of the…