Zobrazeno 1 - 10
of 296
pro vyhledávání: '"COSTI, T."'
Autor:
Nghiem, H. T. M., Costi, T. A.
Publikováno v:
Phys. Rev. B 104, 205113 (2021)
The self-energy method for quantum impurity models expresses the correlation part of the self-energy in terms of the ratio of two Green's functions and allows for a more accurate calculation of equilibrium spectral functions than is possible directly
Externí odkaz:
http://arxiv.org/abs/2109.01580
Publikováno v:
Phys. Rev. B 101, 115117 (2020)
We investigate several definitions of the time-dependent spectral function $A(\omega,t)$ of the Anderson impurity model following a quench and within the time-dependent numerical renormalization group method. In terms of the two-time retarded Green f
Externí odkaz:
http://arxiv.org/abs/1912.08474
Autor:
Costi, T. A.
Publikováno v:
Phys. Rev. B 100, 155126 (2019)
Signatures of the Kondo effect in the electrical conductance of strongly correlated quantum dots are well understood both experimentally and theoretically, while those in the thermopower have been the subject of recent interest. Here, we extend theor
Externí odkaz:
http://arxiv.org/abs/1910.08785
Autor:
Costi, T. A.
Publikováno v:
Phys. Rev. B 100, 161106(R) (2019)
Recent experiments have measured the signatures of the Kondo effect in the zero-field thermopower of strongly correlated quantum dots [Svilans {\em et al.,} Phys. Rev. Lett. {\bf 121}, 206801 (2018); Dutta {\em et al.,} Nano Lett. {\bf 19}, 506 (2019
Externí odkaz:
http://arxiv.org/abs/1910.08523
Autor:
Dutta, B., Majidi, D., Corral, A. Garcia, Erdman, P., Florens, S., Costi, T., Courtois, H., Winkelmann, C. B.
Publikováno v:
Nano Lett., 2019, 19 (1), 506
We report on the first measurement of the Seebeck coefficient in a tunnel-contacted and gate-tunable individual single-quantum dot junction in the Kondo regime, fabricated using the electromigration technique. This fundamental thermoelectric paramete
Externí odkaz:
http://arxiv.org/abs/1811.04219
Publikováno v:
Phys. Rev. B 98, 195138 (2018)
We employ the functional renormalization group to study the effects of phonon-assisted tunneling on the nonequilibrium steady-state transport through a single level molecular quantum dot coupled to electronic leads. Within the framework of the spinle
Externí odkaz:
http://arxiv.org/abs/1808.01211
Autor:
Nghiem, H. T. M., Costi, T. A.
Publikováno v:
Phys. Rev. B 98, 155107 (2018)
We develop an alternative time-dependent numerical renormalization group (TDNRG) formalism for multiple quenches and implement it to study the response of a quantum impurity system to a general pulse. Within this approach, we reduce the contribution
Externí odkaz:
http://arxiv.org/abs/1803.04098
Publikováno v:
Phys. Rev. B 96, 195156 (2017)
We investigate the effect of vibrational degrees of freedom on the linear thermoelectric transport through a single-level quantum dot described by the spinless Anderson-Holstein impurity model. To study the effects of strong electron-phonon coupling,
Externí odkaz:
http://arxiv.org/abs/1709.02639
Publikováno v:
Phys. Rev. B 96, 195155 (2017)
We investigate the spinless Anderson-Holstein model routinely employed to describe the basic physics of phonon-assisted tunneling in molecular devices. Our focus is on small to intermediate electron-phonon coupling; we complement a recent strong coup
Externí odkaz:
http://arxiv.org/abs/1709.02636
Autor:
Nghiem, H. T. M., Costi, T. A.
Publikováno v:
Phys. Rev. Lett. 119, 156601 (2017)
We investigate the time evolution of the Kondo resonance in response to a quench by applying the time-dependent numerical renormalization group (TDNRG) approach to the Anderson impurity model in the strong correlation limit. For this purpose, we deri
Externí odkaz:
http://arxiv.org/abs/1701.07558