Coherence loss and recovery of an electron spin coupled inhomogeneously to a one-dimensional interacting spin bath: an adaptive t-DMRG study
| dc.creator | Wang, Zhi-Hui | |
| dc.creator | Wang, Bing-Shen | |
| dc.creator | Su, Zhao-Bin | |
| dc.date | 2008-07-31 | |
| dc.date.accessioned | 2026-07-07T10:03:38Z | |
| dc.date.available | 2026-07-07T10:03:38Z | |
| dc.description | Coherence evolution and echo effect of an electron spin, which is coupled inhomogeneously to an interacting one-dimensional finite spin bath via hyperfine-type interaction, is studied using the adaptive time dependent density matrix renormalization group (t-DMRG) method. It is found that the interplay of the coupling inhomogeneity and the transverse intra-bath interactions results in two qualitatively different coherence evolutions, namely, a coherence preserving evolution characterized by periodic oscillation and a complete decoherence evolution. Correspondingly, the echo effects induced by an electron spin flip at time $τ$ exhibit stable recoherence pulse sequence for the periodic evolution and a single peak at $\sqrt 2 τ$ for the decoherence evolution, respectively. With the diagonal intra-bath interaction included, the specific feature of the periodic regime is kept, while the $\sqrt 2τ$-type echo effect in the decoherence regime is significantly affected. To render the experimental verifications possible, the Hahn echo envelope as a function of $τ$ is calculated, which eliminates the inhomogeneous broadening effect and serves for the identification of the different status of the dynamic coherence evolution, periodic versus decoherence. | |
| dc.description | Accepted for publication in Phys. Rev. B | |
| dc.identifier | https://arxiv.org/abs/0807.5071 | |
| dc.identifier | http://arxiv.org/abs/0807.5071 | |
| dc.identifier | Physical Review B 78, 054433 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.78.054433 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/169359 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Statistical Mechanics | |
| dc.subject | Quantum Physics | |
| dc.title | Coherence loss and recovery of an electron spin coupled inhomogeneously to a one-dimensional interacting spin bath: an adaptive t-DMRG study | |
| dc.type | text |