Trapping of single-ions Successfully
Breakthrough in Research of Two-dimension
In recent years, the research on various cobalt
oxides has attracted extensive attention of scientists, which is mainly
because the super-conductivity in MaxCoO2-H2O with two dimensional triangular
lattice was discovered. One of the very important materials is Sr2CoO4,
which has the same two dimensional square lattice structure as the typical
high-temperature super-conductivity materials.
Prof. Zhong Fang from the Institute of Physics, CAS cooperated with Prof. Y. Koura from the Tokyo University of Japan has made a specific study of a series of physical properties of this material and found that this material has no super-conductivity, but has very good ferromagnetism. Detailed calculation of its electronic structure demonstrates that Co in the system has an intermediate spin state. The result of calculation can give a good explanation about the observed photo-electricity conductivity of anisotropy.
This finding was published in the Physical
Review Letter 93, 167202 (2004).
Breakthrough in Research on GaN-based
On Nov. 16, a breakthrough was announced regarding
the successful development of GaN-based laser diodes, which is a major
project of the national 863 program undertaken by the Institute of Semiconductor
of CAS. The GaN-based laser Diode with independent intellectual property
was developed and fabricated for the first time in mainland China after
tackling a series of technological difficulties, such as design of the
device structure, material growth, cleavage of the cavity mirror and test
analysis. The laser Diode adopts multi-quantum wells with gain waveguide
structure. The lasing wavelength is 410nm, strip width 5¦Ìm, and strip
length 800¦Ìm. The threshold current density is about 5KA/cm2. This achievement
marked the research on GaN-based opto-electronic materials and devices
have paralleled with the International advanced level.
"Daniel C. Tsui Lectures"
Started in Institute of Physics
Recently, the Institute of Physics, CAS invited
Prof. Nai-Phuam Ong, a world-famous physicist, to pay a visit and give
a lecture in the Institute and thus made the "Daniel C. Tsui Lectures".
More than 200 research staffs and postgraduates listened to his lecture.
Daniel C. Tsui, Nobel Prize
laureate of 1998 in Physics, is professor of the Princeton University
in the U.S. On his visit to the Institute of Physics in Dec. 2003, he
expressed his great expectation on the Chinese physics and the development
of the Institute of Physics. He showed more concern about the development
of the Institute and would spend more efforts to help with education of
the Chinese young talents in physics. Through consultation, it was decided
to establish "Daniel C. Tsui Lectures", with which Nobel Prize
laureates or internationally first-rank physicists will be invited to
pay a short visit to the institute for academic exchange, and to provide
guidance and evaluation on the research of the Institute of Physics.
Chinese-German Forum on Fundamental
and Technological Perspectives of Nanoscience Sponsored by Institute of
The Chinese-German Forum on Fundamental and
Technological Perspectives of Nanoscience is convened in the Institute
of Physics on Sept 26.
Prof. Sishen Xie, member of CAS and research
fellow of the Institute of Physics chaired the forum. Prof. Harald Fuchs
from the Munster University, Germany gave a lecture entitled Fundamental
and Perspectives from Nanosicence to Nano Technology. Prof. Helmut Zacharias
and Prof. Lifeng Chi from the Munster University, Germany, Prof. Gerhard
Wilde from the Karlsruhe Research Center, Prof. Hans Albert Kolb and Prof.
Peter Von Blanckenhagen from the Hannover University gave wonderful lectures
at the symposium. More than 100 people attended the symposium.
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