Neder, IzharRudner, MarkBluhm, HendrikFoletti, SandraHalperin, BertrandYacoby, Amir2012-01-102011Neder, Izhar, Mark Rudner, Hendrikn Bluhm, Sandra Foletti, Bertrand Halperin, and Amir Yacoby. 2011. Semi-classical model for the dephasing of a two-electron spin qubit coupled to a coherently evolving nuclear spin bath. Physical Review B 84(3): 035441.1550-235Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:7480858We study electron spin decoherence in a two-electron double quantum dot due to the hyperfine interaction, under spin-echo conditions as studied in recent experiments. We develop a semi-classical model for the interaction between the electron and nuclear spins, in which the time-dependent Overhauser fields induced by the nuclear spins are treated as classical vector variables. Comparison of the model with experimentally-obtained echo signals allows us to quantify the contributions of various processes such as coherent Larmor precession and spin diffusion to the nuclear spin evolution.en-USJournal Article2012-01-1010.1103/PhysRevB.84.035441