Low-temperature fate of the 0.7 structure in a point contact: a Kondo-like correlated state in an open system
| Autor: | David Goldhaber-Gordon, Ned S. Wingreen, Vladimir Umansky, Kenji Hirose, S. M. Cronenwett, Charles Marcus, Leo P. Kouwenhoven, Heather J. Lynch |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Physics
Condensed matter physics Spin states Condensed Matter - Mesoscale and Nanoscale Physics Strongly Correlated Electrons (cond-mat.str-el) Quantum point contact General Physics and Astronomy Conductance FOS: Physical sciences Open system (systems theory) Point contact Condensed Matter - Strongly Correlated Electrons Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Condensed Matter::Strongly Correlated Electrons Conductance quantum Scaling Quantum |
| Zdroj: | Physical review letters. 88(22) |
| ISSN: | 0031-9007 |
| Popis: | Besides the usual conductance plateaus at multiples of 2e(2)/h, quantum point contacts typically show an extra plateau at approximately 0.7(2e(2)/h), believed to arise from electron-electron interactions that prohibit the two spin channels from being simultaneously occupied. We present evidence that the disappearance of the 0.7 structure at very low temperature signals the formation of a Kondo-like correlated spin state. Evidence includes a zero-bias conductance peak that splits in a parallel field, scaling of conductance to a modified Kondo form, and consistency between peak width and the Kondo temperature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|