身体是革命的本钱。长期从事高强度脑力劳动的年轻或不再年轻的科研工作者们，如何在紧张忙碌、忧思竭虑的生活常态下保持身体的健康？如何在压力山大、心力俱疲之际依然能拥有饱满的状态，迸发出思想的火花？
Quantum gases with Feshbach resonance provide an ideal platform to study the quantum many-body problems. One of the examples that have attracted much attention both experimentally and theoretically is the Bose gases on the upper branch of a Feshbach resonance, i.e., a quantum gas of scattering bosons, where the scattering length can be tuned. The resonance, where the scattering length diverges, corresponds to a strong coupling fixed point and poses a theoretical challenge because of the absence of controllable expansion. By applying a self-consistent effective field theory approach, we found a rigorous solution to unitary Bose gases near four spatial dimensions. This solution shows a long-lived resonant Bose gas at unitarity, in contrast to the three dimensional case where a many-body instability was predicted. A further study of the three dimensional Bose gases at finite temperatures shows a flat top in the density profile induced by an anomalous compressibility as a precursor of the instability. This might be used as an experimental signature for the many-body instability.
Superconductors containing Iron have been known for a long time (e. g. Th7Fe3 (Tc=1.8 K, 1961), U6Fe (Tc=3.9 K, 1958), Lu2Fe3Si5 (Tc=6.1 K, 1980)). However, superconductivity involving the magnetic Iron 3d electrons was first discovered in 2006 in LaFePO (Tc~5 K). The scientific community mostly ignored this discovery (citing it less than 15 times between its publication and the discovery in 2008 of Tc=26 K in the related La[O1-xFx]FeAs ). Once this higher Tc was discovered, then attention was focused – with the fluorine-doped paper starting a new field of endeavor for the solid state physics community. After a brief introduction on the measurement techniques of small sample calorimetry, this talk focuses on what specific heat reveals about the underlying physics involved in these fascinating iron-based unconventional superconductors.