冷原子气体中交换作用和近藤温度的光学控制
Optical Control of Exchange Interaction and Kondo Temperature in cold Atom Gas
摘要：
冷原子系统中磁性杂质问题的相关性主要取决于巡游费米子原子与定域杂质原子之间交换相互作用的性质。特别是，近藤物理只有在交换相互作用是反铁磁的，并且足够强以产生足够高的近藤温度（$T_K/T_F \ge 0.1$）时才会发生。作为一个例子，聚焦在实验上可访问的超冷$^{173}$ Yb原子的系统，它表明，之间的交换相互作用的一个巡回Yb（$^{1}$ S $_{0}$）原子和一个被困Yb（$^{3}$ P $_{0}$）原子的符号和强度可以光学控制。可以解释的是，随着光强度的增加（从零开始），交换相互作用从铁磁变为反铁磁。当光强低于单重费什巴赫共振时，单重散射长度$a_S$较大且为负值，近藤温度急剧升高。
英文摘要：
The relevance of magnetic impurity problems in cold atom systems depends crucially on the nature of exchange interaction between itinerant fermionic atoms and a localized impurity atom. In particular, Kondo physics occurs only if the exchange interaction is anti-ferromagnetic, and strong enough to yield high enough Kondo temperature ($T_K/T_F \ge 0.1$). Focusing, as an example, on the experimentally accessible system of ultra-cold $^{173}$Yb atoms, it is shown that the sign and strength of an exchange interaction between an itinerant Yb($^{1}$S$_{0}$) atom and a trapped Yb($^{3}$P$_{0}$) atom can be optically controlled. Explicitly, as the light intensity increases (from zero), the exchange interaction changes from ferromagnetic to anti-ferromagnetic. When the light intensity is just below a singlet Feshbach resonance, the singlet scattering length $a_S$ is large and negative, and the Kondo temperature increases sharply.
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