Fabrication of Quantum Wires Based on Selective Doping Mechanism and Its Application to Functional Devices Using Quantum Parallelism

基于选择性掺杂机制的量子线制备及其在量子并行功能器件中的应用

基本信息

批准号：
10450110
负责人：
YOH Kanji
金额：
$ 7.81万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

We have aimed at establishing our original fabrication methods of quantum wires and further developing the method to apply to the realization of the "quantum devices". We have investigated the fabrication and the electronic characterization of the quantum wires grown on facets on (311)A GaAs substrates in addition to the (100) GaAs substrates. Cryogenic temperature measurement on quantum wire transistors showed clear quantum wire characteristics. The major results are described below. (I) We have established a new fabrication methods of device quality quantum wires based on selective doping mechanism on patterned sustrates. Unlike the advanced nano-lithography technique such as electron beam lithography or scanning probe method, the present method was demonstrated to be able to process wafer scale fine structures in one step of growth. The obtained quantum wires were shown to maintain high quality along mm long structurally by Electrostatic Force Microscopy. (ii) Single electron oscill … More tion was observed near pinch-off conditions at 2K. Detailed measurements changing temperature and the external magnetic fields relealed that the potential ondulation along the quantum wire resulted in series of isolated potential pockets of 6meV or so deep. Present results shows degree of flatness of the confinement potential along the mm long quantum wires based on the present method. In addition, we have observed clear conductance oscillations which are clear evidence of 1-dimensional conduction at 77K and 4K. This result strongly indicates that one-dimensional conduction is achieved at up to 77K or more without mode mixing. (iii) Transistor characteristics of the "single wire" transistor were also investigated. The I .5μm gate transistor showed the transconductance of 580mS/mm and 650mS/mm at 300K and 77K respectively. These results belong to high end of the modulation doped transistors based on GaAs/AlGaAs. This result indicates successful fabrication of high quality one-dimensional electron systems. It also revealed extremely small gate leakage current of the order of tens of picoamperes. Together with this low leakage characteristics, the present quantum wire approach was shown to have high potentail of integrated quantum qire transistor circuits based on classical and quantum funcional principles. Less

我们的目标是建立的原始幻想线，并进一步开发了实现TUM设备的方法。 100 GAAS基质。在生长的一个步骤中证明了晶状体的质量尺度。 6mev左右的电源是基于当前的方法，我们观察到了清晰的电导振荡，这是17K和4K的1次峰还研究了“单线”晶体管成功制造一维电子系统。