Butov L V, Levitov L S, Mintsev A V, Simons B D, Gossard A C, Chemla D S
Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Phys Rev Lett. 2004 Mar 19;92(11):117404. doi: 10.1103/PhysRevLett.92.117404. Epub 2004 Mar 18.
The macroscopic rings observed in the photoluminescence patterns of excitons in coupled quantum wells are explained by a mechanism of carrier imbalance, transport, and recombination. The rings originate from the spatial separation of p and n carriers, and occur at the interface of the p and n domains, where excitons are generated. We explore the states of excitons in the ring over a range of temperatures down to 380 mK and report a transition of the ring into a periodic array of aggregates, a new low-temperature ordered exciton state.
耦合量子阱中激子光致发光图案中观察到的宏观环，是由载流子失衡、输运和复合机制来解释的。这些环源自p型和n型载流子的空间分离，发生在p型和n型区域的界面处，激子就在此处产生。我们在低至380 mK的一系列温度范围内探究了环中激子的状态，并报告了环向聚集体周期性阵列的转变，这是一种新的低温有序激子态。
