Sharp peaks in the conductance of a double quantum dot and a quantum-dot spin valve at high temperatures: A hierarchical quantum master equation approach
2016 | journal article. A publication with affiliation to the University of Göttingen.
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Sharp peaks in the conductance of a double quantum dot and a quantum-dot spin valve at high temperatures: A hierarchical quantum master equation approach
Wenderoth, S. ; Bätge, J. & Härtle, R. (2016)
Physical Review B, 94(12) art. 121303. DOI: https://doi.org/10.1103/PhysRevB.94.121303
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Details
- Authors
- Wenderoth, S. ; Bätge, J.; Härtle, R.
- Abstract
- We study sharp peaks in the conductance-voltage characteristics of a double quantum dot and a quantum dot spin valve that are located around zero bias. The peaks share similarities with a Kondo peak but can be clearly distinguished, in particular as they occur at high temperatures. The underlying physical mechanism is a strong current suppression that is quenched in bias-voltage dependent ways by exchange interactions. Our theoretical results are based on the quantum master equation methodology, including the Born-Markov approximation and a numerically exact, hierarchical scheme, which we extend here to the spin-valve case. The comparison of exact and approximate results allows us to reveal the underlying physical mechanisms, the role of first-, second- and beyond-second-order processes and the robustness of the effect.
- Issue Date
- 2016
- Status
- published
- Publisher
- Amer Physical Soc
- Journal
- Physical Review B
- ISSN
- 2469-9950
- eISSN
- 2469-9969
- ISSN
- 2469-9969; 2469-9950
- Language
- English