Relation between the 0.7 anomaly and the Kondo effect: Geometric crossover between a quantum point contact and a Kondo quantum dot Article Swipe
Jan Heyder
,
F. Bauer
,
E. Schubert
,
David Borowsky
,
Dieter Schuh
,
W. Wegscheider
,
Jan von Delft
,
Stefan Ludwig
·
YOU?
·
· 2015
· Open Access
·
· DOI: https://doi.org/10.1103/physrevb.92.195401
YOU?
·
· 2015
· Open Access
·
· DOI: https://doi.org/10.1103/physrevb.92.195401
Quantum point contacts (QPCs) and quantum dots (QDs), two elementary building\nblocks of semiconducting nanodevices, both exhibit famously anomalous\nconductance features: the 0.7-anomaly in the former case, the Kondo effect in\nthe latter. For both the 0.7-anomaly and the Kondo effect, the conductance\nshows a remarkably similar low-energy dependence on temperature $T$,\nsource-drain voltage $V_{\\rm sd}$ and magnetic field $B$. In a recent\npublication [F. Bauer et al., Nature, 501, 73 (2013)], we argued that the\nreason for these similarities is that both a QPC and a KQD feature spin\nfluctuations that are induced by the sample geometry, confined in a small\nspatial regime, and enhanced by interactions. Here we further explore this\nnotion experimentally and theoretically by studying the geometric crossover\nbetween a QD and a QPC, focussing on the $B$-field dependence of the\nconductance. We introduce a one-dimensional model that reproduces the essential\nfeatures of the experiments, including a smooth transition between a Kondo QD\nand a QPC with 0.7-anomaly. We find that in both cases the anomalously strong\nnegative magnetoconductance goes hand in hand with strongly enhanced local spin\nfluctuations. Our experimental observations include, in addition to the Kondo\neffect in a QD and the 0.7-anomaly in a QPC, Fano interference effects in a\nregime of coexistence between QD and QPC physics, and Fabry-Perot-type\nresonances on the conductance plateaus of a clean QPC. We argue that\nFabry-Perot-type resonances occur generically if the electrostatic potential of\nthe QPC generates a flatter-than-parabolic barrier top.\n
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1103/physrevb.92.195401
- OA Status
- green
- Cited By
- 22
- References
- 44
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W1493808311
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W1493808311Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1103/physrevb.92.195401Digital Object Identifier
- Title
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Relation between the 0.7 anomaly and the Kondo effect: Geometric crossover between a quantum point contact and a Kondo quantum dotWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
-
2015Year of publication
- Publication date
-
2015-11-03Full publication date if available
- Authors
-
Jan Heyder, F. Bauer, E. Schubert, David Borowsky, Dieter Schuh, W. Wegscheider, Jan von Delft, Stefan LudwigList of authors in order
- Landing page
-
https://doi.org/10.1103/physrevb.92.195401Publisher landing page
- Open access
-
YesWhether a free full text is available
- OA status
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greenOpen access status per OpenAlex
- OA URL
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https://arxiv.org/pdf/1409.3415Direct OA link when available
- Concepts
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Condensed matter physics, Physics, Kondo effect, Quantum dot, Anomaly (physics), Conductance, Spin (aerodynamics), Quantum mechanics, Electrical resistivity and conductivity, ThermodynamicsTop concepts (fields/topics) attached by OpenAlex
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22Total citation count in OpenAlex
- Citations by year (recent)
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2025: 1, 2024: 1, 2022: 1, 2021: 3, 2020: 3Per-year citation counts (last 5 years)
- References (count)
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44Number of works referenced by this work
- Related works (count)
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10Other works algorithmically related by OpenAlex
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