Two-channel Kondo physics in tunnel-coupled double quantum dots
We investigate theoretically the possibility of observing two-channel Kondo (2CK) physics in tunnel-coupled double quantum dots (TCDQDs), at both zero and finite magnetic fields; taking the two-impurity Anderson model (2AIM) as the basic TCDQD model, together with effective low-energy models arising...
| المؤلفون الرئيسيون: | , , |
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| التنسيق: | Journal article |
| اللغة: | English |
| منشور في: |
2011
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| _version_ | 1826290069129920512 |
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| author | Jayatilaka, F Galpin, MR Logan, D |
| author_facet | Jayatilaka, F Galpin, MR Logan, D |
| author_sort | Jayatilaka, F |
| collection | OXFORD |
| description | We investigate theoretically the possibility of observing two-channel Kondo (2CK) physics in tunnel-coupled double quantum dots (TCDQDs), at both zero and finite magnetic fields; taking the two-impurity Anderson model (2AIM) as the basic TCDQD model, together with effective low-energy models arising from it by Schrieffer-Wolff transformations to second and third order in the tunnel couplings. The models are studied primarily using Wilson's numerical renormalization group. At zero-field our basic conclusion is that while 2CK physics arises in principle provided the system is sufficiently strongly-correlated, the temperature window over which it could be observed is much lower than is experimentally feasible. This finding disagrees with recent work on the problem, and we explain why. At finite field, we show that the quantum phase transition known to arise at zero-field in the two-impurity Kondo model (2IKM), with an essentially 2CK quantum critical point, persists at finite fields. This raises the prospect of access to 2CK physics by tuning a magnetic field, although preliminary investigation suggests this to be even less feasible than at zero field. |
| first_indexed | 2024-03-07T02:38:33Z |
| format | Journal article |
| id | oxford-uuid:a9a4045d-ee1d-48bb-b7fb-eda2439bd9c6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:38:33Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:a9a4045d-ee1d-48bb-b7fb-eda2439bd9c62022-03-27T03:09:48ZTwo-channel Kondo physics in tunnel-coupled double quantum dotsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a9a4045d-ee1d-48bb-b7fb-eda2439bd9c6EnglishSymplectic Elements at Oxford2011Jayatilaka, FGalpin, MRLogan, DWe investigate theoretically the possibility of observing two-channel Kondo (2CK) physics in tunnel-coupled double quantum dots (TCDQDs), at both zero and finite magnetic fields; taking the two-impurity Anderson model (2AIM) as the basic TCDQD model, together with effective low-energy models arising from it by Schrieffer-Wolff transformations to second and third order in the tunnel couplings. The models are studied primarily using Wilson's numerical renormalization group. At zero-field our basic conclusion is that while 2CK physics arises in principle provided the system is sufficiently strongly-correlated, the temperature window over which it could be observed is much lower than is experimentally feasible. This finding disagrees with recent work on the problem, and we explain why. At finite field, we show that the quantum phase transition known to arise at zero-field in the two-impurity Kondo model (2IKM), with an essentially 2CK quantum critical point, persists at finite fields. This raises the prospect of access to 2CK physics by tuning a magnetic field, although preliminary investigation suggests this to be even less feasible than at zero field. |
| spellingShingle | Jayatilaka, F Galpin, MR Logan, D Two-channel Kondo physics in tunnel-coupled double quantum dots |
| title | Two-channel Kondo physics in tunnel-coupled double quantum dots |
| title_full | Two-channel Kondo physics in tunnel-coupled double quantum dots |
| title_fullStr | Two-channel Kondo physics in tunnel-coupled double quantum dots |
| title_full_unstemmed | Two-channel Kondo physics in tunnel-coupled double quantum dots |
| title_short | Two-channel Kondo physics in tunnel-coupled double quantum dots |
| title_sort | two channel kondo physics in tunnel coupled double quantum dots |
| work_keys_str_mv | AT jayatilakaf twochannelkondophysicsintunnelcoupleddoublequantumdots AT galpinmr twochannelkondophysicsintunnelcoupleddoublequantumdots AT logand twochannelkondophysicsintunnelcoupleddoublequantumdots |