國家理論科學研究中心(南區)物理組

Mission Summary:

The availability of high speed bullet train in 2007 will enhance the cooperation and partnership of scientists between the south and the north. Moreover, foreign scholars will have the opportunity to visit southern Taiwan even under tight schedule in the same manner as from Taipei to visit Hsinchu. With this in mind, while the focus group of low dimensional systems and nanostructures will continue to serve its membership primarily residing in southern Taiwan, it will encourage more colleagues in the north and in other countries to attend workshops held in Southern Taiwan. Tentatively, we would suggest two major vents in a year and invite in addition to domestic scholars, one foreign scholar each time, to bring us new perspectives on subjects of nano tubes, photonic crystals, spintronics, molecular dynamics, transport, and molecular computers, etc.

It is well said that the nineteenth century is the century of iron, twentieth century is silicon, and twenty-first will be carbon. It is also clear that the nineteenth century is the century of macro technology, twentieth century is micro technology, and twenty-first will be the nano technology. While members of the current focus group mainly work on carbon related nanostructures, quantum dot and quantum transport, promoting the interactions and collaborations among group members, new faculty and research staff, will expand our expertise and research topics. The next quantum jump in computer technology will undoubtedly be the molecular computer. This will enable the molecular IO devices among other novelties. Nano technology will be the driving force. This focus group would have the potential of continuing along a path of cutting edge innovations. Well-designed workgroups to meet on a regular basis should be encouraged. In addition to short-term domestic and foreign visitors, we would also like to bring foreign scholars to fill in postdoc positions under the guidance of senior researchers.

 

Mission Summary:

1. Carbon-related nanostructures

Although water is the universal medium for life on Earth, most of the chemicals that make up living organisms are based on the element carbon. Of all chemical elements, carbon is unparallel in its ability to form molecules that are large, complex, and diverse, and this molecular diversity has made possible the diversity of living beings that have evolved on Earth. The famous carbon family includes carbon nano tube (CNT), graphite, and diamond. The bulky ball or fullerene - in which the atoms are arranged in a closed shell was discovered in 1985 by Robert F. Curl, Harold W. Kroto and Richard E. Smalley. The carbon bulky ball C60 revealed the greatness and beauty of nano structures. The fullerene may be considered as a zero dimensional entity, the carbon nano tube a one dimensional entity, the graphite two dimensional, and diamond three
dimensional. Some of the members of the focus groups (MF Lin, CP Chang, RB Chen, TC Leung, FL Shyu, SJ Sun) are experienced in the study of the electric, quantum transport, field-emission, optical, and magnetic properties of carbon-related nanostructures, e.g. nanotubes and CN compounds. The focus group should promote interaction and collaboration among members of this group for integrating the available research methods as well as manpower in exploring carbon-related nanostructures.

2. Nanoparticles on semiconductor surfaces and in bulks

Nanoparticles on semiconductor surfaces form various interesting phases. It is resulted from the complex many-body effects between nanoparticles and the surfaces as well as between nanoparticles on the surfaces. In addition to the order and disorder phases, it has long been recognized that the 2D incommensurate phases can frequently be induced in these systems involving restructuring of the supporting surfaces. This is, again, due to the competing interactions between the nanoparticles-surface and the nanoparticle-nanoparticle factors. The systems can be even more interesting when the nanoparticles carry magnetic moments with spin in the physical picture. Nanoparticles in semiconductor bulks may form quantum dots, quantum rings and more. Quantum dots, in additional to the applications in semiconductor devices, e.g. LED and Laser, are considered as one of the most promising candidates for quantum devices in quantum computers. However, studies for most of the intrinsic physical properties, e.g. incoherent time, of quantum dots as well as those when quantum dots are under designed conditions for implementing quantum-gate processes are still in the early stage. In this part of focus, close interactions and collaborations with the Quantum-Information focus
group will be established to benefit both groups on the possible applications of the quantum dots for the quantum devices.

3. Molecular Devices

Nano science deals with construct of molecular precision. Great accuracy in calculating the molecular structure is required to design molecular device. The next quantum jump in computer technology will undoubtedly be the molecular computer. Nano technology will be the driving force. Recent progress in molecular device has produced molecular diode of size one thousandth of the current semiconductor diode. The understanding of fractional quantization unit in hydrogen molecule MCBJ (Mechanically Controlled Breakable Junction) was explained as due to the dissociation of hydrogen molecular by the gold nano wire. Theoretical efforts applying the nonequlibrium Green's function method and density functional theory to understand molecular devices or carbon nano tubes are rather intensive. To understand molecular structures, we have developed the correlated configuration interaction (CCI) model and self-consistent density functional theory (SCDFT). To calculate the electrical transport, tight binding (TB) model and the Green's function method have been applied. This method will be generalized by applying the divide-and-conquer, recursion, tight-binding, and high order correlation and coherence effects to calculate larger atoms and molecules in terms of order N algorithm.

● Activities being Proposed

To promote interactions between the researchers in the field, the activities that have been and will be held by the group, include regular talks, series of talks, study-group meetings, mini-school, workshops, short-term domestic and foreign visitors. These are the workshops held in the past: “Low-dimensional Nanomaterial Physics for Young Researchers”, and “Nanocarbon Workshop”. A mini-school on “Photonic Crystal” was also organized in addition to the study group regular meetings. The “First Principle Group” meeting was regularly held at NCTU while the coordinator was in Hsinchu. Currently, two people expressed interest in visiting NCTS in 2007, Shmuel Gurvitz, Professor of Physics, Weizmann Institute, Rehovot, Israel, and Lay-Kee ANG (Ricky), Assistant Professor, Nanyang Technological University, Singapore. It was also suggested to invite Professor Maruyama of Tokyo University to join our workshop.

 

Committee members:

Jang-Yu Hsu(coordinator) Nat'l Cheng Kung Univ.
Min-Fa Lin Nat'l Cheng Kung Univ.
C. P. Chang Tainan Univ. of Technology
R. B. Chen Nat'l Kaohsiung Marine Univ.
De-Hone Lin National Sun Yat-sen University
Yan-Chr Tsai Nat'l Chung Cheng Univ.

 

Members of the focus group:

許正餘 J. Y. Hsu (coordinator)

成功大學物理系

JYHsu@phys.ncku.edu.tw

林明發 Min-Fa Lin

成功大學物理系

mflin@mail.ncku.edu.tw

張振鵬 C. P. Chang

台南女子技術學院通識中心

t00252@ms.twcat.edu.tw

陳榮斌 R. B. Chen

高雄海洋大學通識中心

rbchen@mail.nkmu.edu.tw

鄭靜 Ching Cheng

成功大學物理系

ccheng@phys.ncku.edu.tw

李進榮 Chin-Rong Lee

中正大學物理系

phycrl@ccu.edu.tw

李道聖 T. S. Li

崑山科技大學電機系

tsli@mail.ksut.edu.tw

梁贊全 Tsan-Chuen Leung

中正大學物理系

tcleung@phy.ccu.edu.tw

林財鈺 Chai-Yu Lin

中正大學物理系

lincy@phy.ccu.edu.tw

盧炎田 Yin-Tin Lu

成功大學物理系

ytlu@mail.ncku.edu.tw

徐鳳麟 F. L. Shyu

陸軍軍官學校物理系

fl.shyu@msa.hinet.net

孫士傑 Shih-Jye. Sun

高雄大學應物系

sjs@nuk.edu.tw

蔡炎熾 Yan-Chr Tsai

中正大學物理系

tyan@phy.ccu.edu.tw

蔡秀芬 Shiow-Fon Tsay

中山大學物理系

tsaysf@mail.nsysu.edu.tw

楊志開 C. K. Yang

長庚大學通識教育中心

ckyang@mail.cgu.edu.tw

莊豐權 Feng-Chuan Chuang

中山大學物理系

fchuang@mail.nsysu.edu.tw

林德鴻 De-Hone Lin

中山大學物理系

dhlin@mail.nsysu.edu.tw

蔡春鴻 Chuen-horng Tsai

清華大學工科系

chtsai@mail.ess.nthu.edu.tw

許永昌 Young-Chung Hsue

成功大學物理系

ychsue@mail.ncku.edu.tw

陳岳男 Yueh-Nan Chen

成功大學物理系

ynchen.ep87g@nctu.edu.tw

蔡民雄 Min-Hsiung Tsai

中山大學物理系

tsai@mail.phys.nsysu.edu.tw

張世慧 Shih-Hui Chang

成功大學光電所

gilbert@mail.ncku.edu.tw