How sharply does the Anderson model depict a single-electron transistor?.
ZAWADZKI, Krissia; OLIVEIRA, Luiz Nunes de.
ZAWADZKI, Krissia; OLIVEIRA, Luiz Nunes de.
 Abstract: The single-impurity Anderson model has been the focus of theoretical studies of molecular junctions and the single-electron transistor, a nanostructured device comprising a quantum dot that bridges two otherwise decoupled metallic leads. The low-temperature transport properties of the model are controlled by the ground-state occupation of the quantum dot, a circumstance that recent density-functional approaches have explored. Here we show that the ground-state dot occupation also parametrizes a linear mapping between the thermal dependence of the zero-bias conductance and a universal function of the temperature scaled by the Kondo temperature. Careful measurements by Grobis and co-workers are very accurately tted by the universal mapping. Nonetheless, the dot occupation and an asymmetry parameter extracted from the same mapping are relatively distant from the expected values. We conclude that mathematical results derived from the model Hamiltonian reproduce accurately the universal physical properties of the device. In contrast, non-universal features cannot be reproduced quantitatively. To circumvent this limitation, ab initio studies of the device at high energies seem necessary, to accurately de ne the model Hamiltonian. Our conclusion reinforces ndings by Gross and coworkers, who applied time-dependent density-functional theory to show that, to describe the low-energy properties of molecular junctions, one must be able to describe the high-energy regime. | |
| European Physical Journal B |
| v. 91, n. 7, p. 136-1-136-11 - Ano: 2018 |
| Fator de Impacto: 1,536 |
| http://dx.doi.org/10.1140/epjb/e2018-90164-y |  @article={002892355,author = {ZAWADZKI, Krissia; OLIVEIRA, Luiz Nunes de.},title={How sharply does the Anderson model depict a single-electron transistor?},journal={European Physical Journal B},note={v. 91, n. 7, p. 136-1-136-11},year={2018}} |
