ELECTRONIC STATES OF (GaP)m(AlP)n SHORT PERIOD SUPERLATTICES AND MULTI-QUANTUM WELL STRUCTURES AND THE MECHANISM OF PHOTOLUMINESCENCE

(GaP)m(AlP)n短周期超晶格和多量子阱结构的电子态及光致发光机制

• 批准号: 08454086
• 负责人: KAMIMURA Hiroshi
• 金额: $ 4.99万
• 依托单位: SCIENCE UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454086/
• 关键词: first principles; bound exciton; semiconductor superlattices; strong magnetic field; optical properties; copper oxides; many-electreon states; antiferro magnetic order; 高温超伝導; YBCO; 超伝導状態; 多重量子井戸構造; 理論; 励起子; ガリウム燐; アルミニウム燐; アルカリハライド超格子; 膜

This three-year research project started on April of 1996 and has been conducted successfully. The aim of this project was twofold : One was to elucidate the origin of the unusual behavior of photoluminescence (PL) observed in (GaP)n(AJIP)n short period superlattices, in which the PL intensity decreases with increasing a magnetic field in the strong field regime in the Faraday configuration. In the present research we have clarified that a bound exciton trapped at a pseudo-dot type defect at the interface is responsible for the above unusual behavior. The present result was appreciated in the field of semiconductors and we have given a talk in international conferences. Another aim was to clarify a many-body electronic structures of underdoped cuprates. By using the multi-configuration self-consistent field variational method for a single CuO_5 pyramid embedded in YBCO7 with Tc=90K and then by introducing the transfer interactions between CuO_5 pyramids, unusual electronic states were clarified. That is, the dopant holes move coherently by taking the Zhang-Rice spin singlet and Hund's coupling triplet alternately in the apin correlated region of anti-ferromagnetic ordering due to Cu localized spins, without destroying the anti-ferromagnetic order.

这个为期三年的研究项目始于1996年4月，并已成功进行。该项目的目的是双重的：一个是阐明在（gap）n（ajip）n短期超晶格中观察到的光致发光（PL）的异常行为的起源，其中PL强度随着在磁场中增加磁场而降低。法拉第配置中的强场式。在本研究中，我们澄清说，在界面处被困在伪点类型缺陷处的绑定激子负责上述异常行为。目前的结果在半导体领域得到了赞赏，我们在国际会议上进行了演讲。另一个目的是阐明不足的铜层的多体电子结构。通过使用嵌入YBCO7中的单个CUO_5金字塔的多种构型自洽场变异方法，其TC = 90K，然后通过引入CUO_5金字塔之间的传递相互作用，阐明了不寻常的电子状态。也就是说，掺杂孔通过Zhang-rice旋转单线和Hund的耦合三重态在Apin相关区域中通过CU局部旋转而交替地移动，而不会破坏反铁磁性序列。

项目成果

小林由則,上村洸: "Band structures,optical transition strengths and their pressure dependence of (GaP)_n (AlP)_n short-period superlattices with n=3 to 10" Solid State Communications. 98. 957-960 (1996)

Yoshinori Kobayashi、Ko Uemura：“n=3 至 10 的 (GaP)_n (AlP)_n 短周期超晶格的能带结构、光学跃迁强度及其压力依赖性”固态通信。 98. 957-960 (1996)

上村洸,松野俊一,諏訪雄二,潮秀樹: "Occurrence of d-wave pairing in the phonon-mediated mechanism of high temperature superconductivity in cuprates" Physical Review Letters. 77. 723-726 (1996)

Ko Uemura、Shunichi Matsuno、Yuji Suwa、Hideki Ushio：“铜酸盐高温超导声子介导机制中 d 波配对的出现”物理评论快报 77. 723-726 (1996)。

小林由則, 神津和磨, 上村洸: "Photoluminescence from Bound Exciton States in GaP/AlP Short Period Superlattices in a Strong Magnetic Field" Solid State Commun.109. 583-588 (1999)

Yoshinori Kobayashi、Kazuma Kozu、Ko Uemura：“强磁场中 GaP/AlP 短周期超晶格中束缚激子态的光致发光”Solid State Commun.109 (1999)。

上村洸, 小林由則, 神津和磨: "Mechanism of the Unusual Photoluminescence of GaP/AlP Short Period Superlattices in a Strong Magnetic Field" Proceedings of the 24th International Conference on the Physics of Semiconductors. in press

Ko Uemura、Yoshinori Kobayashi、Kazuma Kozu：“强磁场中 GaP/AlP 短周期超晶格的异常光致发光机制”第 24 届国际半导体物理会议论文集正在出版。

H.Kamimura, S.Matsuno, Y.Suwa and H.Ushio: "A New Theory of Superconducting Copper Oxides From Electronic Structures to the Mechanism-(Invited)" J.Mat.Sci.Eng.B41. 10-15 (1996)

H.Kamimura、S.Matsuno、Y.Suwa 和 H.Ushio：“从电子结构到机理的超导铜氧化物新理论——（特邀）”J.Mat.Sci.Eng.B41。