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We study sharp peaks in the conductance-voltage characteristics of a doublequantum dot and a quantum dot spin-valve that are located around zero bias. Thepeaks share similarities with a Kondo peak but can be clearly distinguished, inparticular as they occur at high temperatures. The underlying physicalmechanism is a strong current suppression that is quenched in bias-voltagedependent ways by exchange interactions. Our theoretical results are based onthe quantum master equation methodology, including the Born-Markovapproximation and a numerically exact, hierarchical scheme, which we extendhere to the spin-valve case. The comparison of exact and approximate resultsallows us to reveal the underlying physical mechanisms, the role of first-,second- and beyond-second-order processes and the robustness of the effect.

physical review. b./physical review. b

Sharp peaks in the conductance of double quantum dot and quantum dot  spin-valve systems at high temperatures: A hierarchical quantum master  equation approach