Payette C, Yu G, Gupta J A, Austing D G, Nair S V, Partoens B, Amaha S, Tarucha S
Institute for Microstructural Sciences M50, NRC, Montreal Road, Ottawa, Ontario, K1A 0R6, Canada.
Phys Rev Lett. 2009 Jan 16;102(2):026808. doi: 10.1103/PhysRevLett.102.026808.
We observe magnetic-field-induced level mixing and quantum superposition phenomena between three approaching single-particle states in a quantum dot probed via the ground state of an adjacent quantum dot by single-electron resonant tunneling. The mixing is attributed to anisotropy and anharmonicity in realistic dot confining potentials. The pronounced anticrossing and transfer of strengths (both enhancement and suppression) between resonances can be understood with a simple coherent level mixing model. Superposition can lead to the formation of a dark state by complete cancellation of an otherwise strong resonance, an effect resembling coherent population trapping in a three-level-system of quantum and atom optics.
我们通过单电子共振隧穿，经由相邻量子点的基态探测一个量子点中三个临近单粒子态之间的磁场诱导能级混合和量子叠加现象。这种混合归因于实际量子点限制势中的各向异性和非简谐性。共振之间明显的反交叉和强度转移（增强和抑制）可以用一个简单的相干能级混合模型来理解。叠加可通过完全抵消原本很强的共振导致暗态的形成，这一效应类似于量子和原子光学三能级系统中的相干布居捕获。
