Condensed Matter Seminars

Overcoming spin decoherence is critical to spintronics and spin-based quantum information processing devices. For spins in the solid state, an interaction with fluctuations of the surrounding spin bath is a major source of spin decoherence. One approach to reducing spin bath fluctuations is to bring the spin bath into a well-known quantum state that exhibits little or no fluctuations. A prime example is the case of a fully-polarized spin bath. We present our recent demonstrations of significant suppression of spin decoherence measured with high-field electron paramagnetic resonance (EPR). One example is nitrogen-vacancy (NV) centers in diamond [1]. Another is S=10 Fe8 single-molecule magnets [2]. We will also present the development of UCSB free-electron laser (FEL)-based pulsed EPR spectrometer which aims for nano-second time resolution.[1] S. Takahashi et al., Phys. Rev. Lett. 101, 047601 (2008). [2] S. Takahashi et al., Phys. Rev. Lett. in-press; arXiv: 0810.1254.