2011 Annual Report (PDF 9.19 MB) - Chinese Academy of Sciences

CHINESE ACADEMY OF SCIENCES
Development of optical
frequency standard based
on single trapped and
cooled ion
The Wuhan Institute of Physics
and Mathematics is one of the
early institutes engaged in ion
storage research. Research
group led by Prof. Gao Kelin
developed ion trapping,
laser cooling and transition
measurement et al. A single
calcium ion can be laser cooled
and trapped steadily in a
miniature Paul trap up to 13
days. They also developed a
narrow line-width laser locked
to the ion’s clock transition.
Clock transition uncertainty
was measured and reached the
10 -14 level (same level done by
the Japanese scientists with
cold calcium ion) and the 10 -15
level (similar level done by the
Austrian Innsbruck University
with ultra cold calcium ion).
Development of optical
frequency standard based on a
single trapped and cooled ion
[ 30 ] / CHINESE ACADEMY OF SCIENCES
Design syntheses and properties of oxo clusters
Prof. Yang Guoyu’s group in the Fujian Institute of Research on the
Structure of Matter, in researching syntheses and properties of oxo
clusters, has not only extended the lacunary substituted reactions
from aqueous syntheses to hydrothermal synthetic systems,
but developed some synthetic strategies to make oxo clusters
containing transition metals, lanthanides and main group elements.
These strategies possess important directions for syntheses of
catalytic, magnetic and nonlinear optical materials, respectively.
They have published more than 130 research papers in international
journals, and contributed two chapters in two books.
Topological Insulators
Researchers from the Institute of Physics predicted that tetradymite
topological insulators Bi2Te 3, Bi2Se3, and Sb2Te 3 doped with Cr or
Fe should support the quantized anomalous Hall (QAH) effect, a
kind of quantum Hall effect without external magnetic field and
corresponding Landau levels. Experimental realization of the long
sought-after QAH insulator state may pave the way for the future
electronics and spintronics with dissipationless transport. It was
published in Science.
Team leader: Prof. Fang Zhong, zfang@aphy.iphy.ac.cn and Prof.
Dai Xi, daix@aphy.iphy.ac.cn