Electron and nuclear spins in semiconductor quantum dots

摘要: The electron and nuclear spin degrees of freedom in two-dimensional semiconductor quantum dots are studied as important resources for such fields spintronics information. coupling spins to their orbital motion, via the spinorbit interaction, spins, hyperfine understanding spin-dynamics dot systems. This work is concerned with both these interactions they relate dots. We first consider spin-orbit interaction many-electron dots, studying its role conductance fluctuations. further explore creation destruction spin-polarized currents by chaotic strong limit, finding that even without magnetic or ferromagnets (i.e., time reversal symmetry) systems can produce large spin-polarizations passing through a small number open channels. use density matrix formalism transport allowing consideration entangled between different leads, which we show have larger fluctuations than not so entangled. Second, electrons approximately 106 nuclei two-electron double each collectively form an effective field interacting spins. procedure originally explored intent polarize also equalize two or, other parameter regimes, iii