半导体量子结构中之电子共振与扰动
- 格式：pdf
- 大小：2.03 MB
- 文档页数：2
十一、研究計畫中英文摘要：
請就本計畫要點作一概述，並依本計畫性質自訂關鍵詞。
（一） 計畫中文摘要。（五百字以內）
半導體量子結構中之電子共振與擾動
這是一個單年期的實驗型計畫，本計畫的目的有三方面：（一）研究介觀尺度半導
體量子結構在微波波段的磁傳輸特性；（二）研究微波場對介觀尺度電子系統傳輸特性
的影響；（三）測量小尺寸電子系統的電子擾動（雜訊）。這個計畫是延續我們整合低
溫技術、微波技術及奈米微影技術，用來探測半導體低維度電子系統傳輸特性的努力。
我們使用到的樣品有：（一）現成長好的低維度電子系統，如標準二維電子系統、
自組裝量子線或量子點；（二）利用電子束微影在含二維電子系統基版上圖樣化及蝕刻
製作的低維度系統，最小尺度必須小於數百奈米。
為了研究低維度電子系統在微波範圍的磁傳輸特性，低維度電子系統可以安插在一
50歐姆特徵阻抗共平面波導兩金屬電極間，或安排在一在一對交錯梳狀傳感器間的表
面波傳輸線上，再用我們利用鎖相迴圈技術自製的超高靈敏度向量微波偵測裝置仔細
檢視改變磁場時傳遞係數的變化，由此數據即可推導出電子系統的傳輸係數或極化
率。由微波響應頻譜，我們即可得到有關電子能階的訊息。
在低維度電子系統的低溫量子電子學的研究，微波偵測和雜訊測量是兩個很有趣且
有挑戰性的領域，希望這個計畫能夠延伸我國在此方面的研究。
關鍵詞：低維度電子系統、半導體、微波、低溫技術、鎖相迴圈、電子束微影、公平面波導、表面聲波、
自旋、量子線、量子點、雜訊、射雜訊
表 C011 共 頁 第 頁
表 C011 共 頁 第 頁
十一、研究計畫中英文摘要：
請就本計畫要點作一概述，並依本計畫性質自訂關鍵詞。
計畫英文摘要。（五百字以內）
Resonances and Fluctuations of Electrons in Semiconductor
Quantum Structures
The purpose of this one-year experimental proposal is threefold: (1) study the microwave
magnetotransport properties of semiconductor quantum structures with mesoscopic size; (2)
study the effect on mesoscopic electron systems in the presence of microwave irradiations;
(3) study the electronic fluctuations, i.e. noises, in small-size electron systems. This project
is our continuing endeavor to integrate microwave technique, cryogenic technique, and
nano-lithography technique to study the transport properties of low-dimensional electron
systems (LDESs) in semiconductors.
We will deal with the following LDES samples: (1) as-grown DLESs, such as simple
2DESs, self-assembled quantum wires and quantum dots; (2) e-beam patterned DLESs with
critical dimension below few hundred nm, usually fabricated from wafers with 2DESs.
To study the magnetotransport properties of LDESs at microwave frequencies, we will
either imbed the LDES in the gap of a 50Ω meandering coplanar waveguide (CPW), or
arrange the LDES on the surface acoustic wave (SAW) delay line between two inter-digit
transducers (IDTs). An ultra high-sensitivity vector microwave detection system based on
phase-lock-loop (PLL) technique is used to carefully scrutinize the change of the
propagation properties of the samples while sweeping magnetic field. We then extract the
transport coefficients or electric polarization from the above data. The spectrum may also
give us the information of the electron energy states of LDESs. We are especially interested
in the spin related phenomena.
Microwave detecting and noise measurement are definitely two interesting and also very
challenging realms in low-temperature quantum electronics for LDESs. We believe this
project may extend the envelope of the research of our country in this field.
Keywords: low-dimensional electron system (DLES), semiconductor, microwave, cryogenic technique, phase
lock loop (PLL), e-beam lithography, coplanar waveguide (CPW), surface acoustic wave (SAW), spin,
quantum wire, quantum dot, noise, shot noise
