【什么是科学松鼠会？】

【我们是谁？】

# 爱祖国，爱党

4月19、20日，达赖会来安娜堡演讲，我将会参加密歇根华人”反对暴力破坏奥运，反对政治干扰奥运”集会。虽然我个人的力量微不足道，但是我需要发出自己的声音。

# 两个物理学实验上的进展

physicswebnature physics

200K的高温超导体？

http://arxiv.org/abs/0804.0824
Title: Evidence for High Tc Superconducting Transitions in Isolated Al45- and Al47- Nanoclusters
Authors: Baopeng Cao, Colleen M. Neal, Anne K. Starace, Yurii N. Ovchinnikov, Vladimir Z. Kresin, Martin F. Jarrold

Abstract: Heat capacities measured for Al45- and Al47- nanoclusters have reproducible jumps at ~ 200 K. These jumps are consistent with theoretical predictions that some clusters with highly degenerate electronic states near the Fermi level will undergo a transition into a high Tc superconducting state. An analysis based on a theoretical treatment of pairing in Al45- and Al47- agrees well with the experimental data in both the value of the critical temperature and in the size and width of the jumps in the heat capacity.

# 冷却镜子的梦想

$H=-hbar omega(x) a^dagger_p a_p + hbar omega_m a^dagger_m a_m$

$H=omega_p a^dagger_p a_p +hbar eta omega_m a^dagger_p a_p (a_m + a^dagger_m) + hbar omega_m a^dagger_m a_m$