Lasing and transport in a multi-level double quantum dot system coupled to a microwave oscillator
Lasing and transport in a multi-level double quantum dot system coupled to a microwave oscillator
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DOI：
10.1103/physrevb.93.045314
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发表时间：
2015-11
影响因子：
3.7
通讯作者：
C. Karlewski;A. Heimes;G. Schon
中科院分区：
文献类型：
--
作者：
C. Karlewski;A. Heimes;G. Schon
我们研究了一个由两个量子点组成的系统，每个量子点都有几个分立的能级，它们相干耦合到一个微波振荡器上。它们被连接到电子引线上，并耦合到声子浴中，两者都导致非弹性过程。对于一个更简单的系统，每个点都有一个单能级，它已经表明，粒子数反转可以通过电子隧穿产生，这在共振情况下导致振荡器的激光型属性。在多能级系统中，可能会出现几种共振情况，其中一些依赖于一系列隧穿过程，这也涉及非共振，非弹性跃迁。振荡器中产生的光子数和电流-电压特性对这些特性高度敏感，因此可以作为微观细节的探针。
We study a system of two quantum dots, each with several discrete levels, which are coherently coupled to a microwave oscillator. They are attached to electronic leads and coupled to a phonon bath, both leading to inelastic processes. For a simpler system with a single level in each dot it has been shown that a population inversion can be created by electron tunneling, which in a resonance situation leads to lasing-type properties of the oscillator. In the multi-level system several resonance situations may arise, some of them relying on a sequence of tunneling processes which also involve non-resonant, inelastic transitions. The resulting photon number in the oscillator and the current-voltage characteristic are highly sensitive to these properties and accordingly can serve as a probe for microscopic details.