TY - JOUR
T1 - Quantum bistability and spin current shot noise of a single quantum dot coupled to an optical microcavity
AU - Djuric, Ivana
AU - Zivkovic, Marko
AU - Search, Chris P.
AU - Recine, Greg
PY - 2008/11/19
Y1 - 2008/11/19
N2 - Here we explore the quantum-mechanical limit of bistability that appears in the spin-dependent transport through a single quantum dot coupled to an optical microcavity. The spin current is generated by electron tunneling between a single doped reservoir and the dot combined with intradot spin-flip transitions induced by a quantized cavity mode. Earlier research has shown that in the classical limit where a large number of such dots interacts with the cavity so that quantum effects were ignorable, the average spin current exhibits bistability as a function of the laser that drives the cavity. We show that in the limit of a single quantum dot this bistability continues to be present in the intracavity photon statistics. Signatures of the bistable photon statistics manifest themselves in the frequency-dependent shot noise of the spin current despite the fact that the quantum-mechanical average spin current no longer exhibits bistability. Besides having significance for future quantum-dot-based optoelectronic devices, our results shed light on the relation between bistability, which is traditionally viewed as a classical effect, and quantum mechanics.
AB - Here we explore the quantum-mechanical limit of bistability that appears in the spin-dependent transport through a single quantum dot coupled to an optical microcavity. The spin current is generated by electron tunneling between a single doped reservoir and the dot combined with intradot spin-flip transitions induced by a quantized cavity mode. Earlier research has shown that in the classical limit where a large number of such dots interacts with the cavity so that quantum effects were ignorable, the average spin current exhibits bistability as a function of the laser that drives the cavity. We show that in the limit of a single quantum dot this bistability continues to be present in the intracavity photon statistics. Signatures of the bistable photon statistics manifest themselves in the frequency-dependent shot noise of the spin current despite the fact that the quantum-mechanical average spin current no longer exhibits bistability. Besides having significance for future quantum-dot-based optoelectronic devices, our results shed light on the relation between bistability, which is traditionally viewed as a classical effect, and quantum mechanics.
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U2 - 10.1103/PhysRevB.78.195316
DO - 10.1103/PhysRevB.78.195316
M3 - Article
AN - SCOPUS:57149132553
SN - 1098-0121
VL - 78
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 19
M1 - 195316
ER -