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Harold Y. Hwang
（東京大学 大学院新領域創製科学研究科 助教授）
（同上） |
| バンド絶縁体の界面を利用した半導体工学と、高温超伝導など特異な状態が次々と発見されてきた強相関系の物理学の成果とを土台として、ペロブスカイト型酸化物を素材にしてヘテロ構造を作成し、バルクの系では見られない新奇な光学物性の探索を行います。具体的には、モット絶縁体を原子スケールで閉じ込め、量子井戸内のモットギャップを光学的手法により観察し、さらに光デバイスへの応用の可能性を探ります。 |
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| （1） |
D. A. Muller, N. Nakagawa, A. Ohtomo, J. L. Grazul, and H. Y. Hwang,
“Atomic-scale Imaging of Nanoengineered Oxygen Vacancy Profiles in SrTiO ,” Nature 430, 657 (2004). |
| （2） |
A. Ohtomo and H. Y. Hwang,"A High-Mobility Electron Gas at the LaAlO/SrTiO Heterointerface"Nature 427, 423 (2004). （JST所属入り） |
| （3） |
A. Ohtomo and H. Y. Hwang,"Surface Depletion in SrTiO,"Applied Physics Letters 84, 1716 (2004).（脚注でJST所属入り） |
| （4） |
A. Ohtomo, D. A. Muller, J. Grazul, and H. Y. Hwang,"Artificial Charge-Modulation in Atomic-Scale Perovskite Titanate Superlattices,"Nature 419, 378 (2002). |
| （5） |
Y. Mukunoki, N. Nakagawa, T. Susaki, and H. Y. Hwang, “Atomically Flat (110) SrTiO3 and Heteroepitaxy,” Applied Physics Letters 86, 171908 (2005). |
| （6） |
N. Nakagawa, M. Asai, Y. Mukunoki, T. Susaki, and H. Y. Hwang, “Magnetocapacitance and Exponential Magnetoresistance in Manganite-Titanate Heterojunctions,” Applied Physics Letters 86, 082504 (2005). |
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| （1） |
自己研究紹介
A general area of exploration has been the unusual physical properties of the doped transition metal oxides. We demonstrated the transport consequences of various phase transitions in nickelates and cuprates. We established electronic bandwidth tuning by static/dynamic lattice distortions in perovskite manganites. This work led to studies establishing spin-polarized tunneling in half-metallic oxide ferromagnets.
We have been exploring the use of chalcogenide glasses for photonic devices. Two examples include the development of thin film waveguides for nonlinear optical response, and the use of chalcogenide lateral claddings for high-speed electro-optic devices.
In the last few years, we have been focusing on oxide heterostructures, in particular the electronic structure at interfaces and in confined geometries. We recently demonstrated the ability to fabricate structures with atomic precision. We are now using these techniques to create novel charge states inaccessible in bulk materials. |
| （2） |
日経産業新聞 2004年1月30日：「絶縁体境界に電流」 |
| （3） |
“Doping at the Nanoscale,” Chemical and Engineering News, Volume 82 Number 32, p. 6, August 9, 2004.
http://pubs.acs.org/cen/news/8232/8232notw1.html |
| （4） |
“News and Views: The Value of Seeing Nothing,” J. Mannhart and D. G. Schlom, Nature 430, 620 (2004) |
| （5） |
日刊工業新聞 2004年8月5日：「酸素欠損超格子構造を作製」 |
| （6） |
“Letter from the President: Hard Science from Hard Materials,” MRS Bulletin, Volume 29 Number 11, p. 781, November 2004. |
| （7） |
“Vacancies May Lead to Atomic Circuits,” Electroline Newsletter, November 2004.
http://www.electroline.com.au/elc/feature_article/item_112004a.asp |
| （8） |
“Harold Y. Hwang Named Outstanding Young Investigator,” MRS Bulletin, Volume 30 Number 2, p. 115, February 2005. |
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| （1） |
"Polycrystalline Ferroelectric Optical Devices,"
H.Y.Hwang and M.Siegert,
filed April 2001, issued February 17, 2004 as U.S. Patent No.6,694,082. |
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| （2） |
"Mesa Geometry Semiconductor Light Emitter Having Chalcogenide Dielectric Coating,"
J.N. Baillargeon,F.Capasso,C.Gmachl, A.L.Hutchinson, H.Y.Hwang, R.Paiella, A.M.Sergent, A.Y.Cho, D.L.Sivco, and A.Tredicucci,
filed July 2000, issued October 8,2002 as U.S.Patent No.6,463,088. |
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| ※（ ）内は、上段が研究者の現在の所属、下段は応募時の所属 |
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