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Transport and excit...
Transport and excitations in a negative-U quantum dot at the LaAlO3/SrTiO3 interface
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- Prawiroatmodjo, Guenevere E.D.K. (author)
- University of Copenhagen
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- Leijnse, Martin (author)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,University of Copenhagen
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- Trier, Felix (author)
- Technical University of Denmark,University of Copenhagen
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- Chen, Yunzhong (author)
- Technical University of Denmark
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- Christensen, Dennis V. (author)
- Technical University of Denmark
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- Von Soosten, Merlin (author)
- University of Copenhagen,Technical University of Denmark
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- Pryds, Nini (author)
- Technical University of Denmark
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- Jespersen, Thomas S. (author)
- University of Copenhagen
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(creator_code:org_t)
- 2017-08-30
- 2017
- English.
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In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 8:1
- Related links:
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http://dx.doi.org/10... (free)
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https://www.nature.c...
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https://doi.org/10.1...
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Abstract
Subject headings
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- In a solid-state host, attractive electron-electron interactions can lead to the formation of local electron pairs which play an important role in the understanding of prominent phenomena such as high T c superconductivity and the pseudogap phase. Recently, evidence of a paired ground state without superconductivity was demonstrated at the level of single electrons in quantum dots at the interface of LaAlO3 and SrTiO3. Here, we present a detailed study of the excitation spectrum and transport processes of a gate-defined LaAlO3/SrTiO3 quantum dot exhibiting pairing at low temperatures. For weak tunneling, the spectrum agrees with calculations based on the Anderson model with a negative effective charging energy U, and exhibits an energy gap corresponding to the Zeeman energy of the magnetic pair-breaking field. In contrast, for strong coupling, low-bias conductance is enhanced with a characteristic dependence on temperature, magnetic field and chemical potential consistent with the charge Kondo effect.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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