title: Quenching spin decoherence in diamond through spin bath polarization.
abstract: We experimentally demonstrate that the decoherence of a spin by a spin bath can be completely eliminated by fully polarizing the spin bath. We use electron paramagnetic resonance at 240 GHz and 8 T to study the electron-spin coherence time T2 of nitrogen-vacancy centers and nitrogen impurities in diamond from room temperature down to 1.3 K. A sharp increase of T2 is observed below the Zeeman energy (11.5 K). The data are well described by a suppression of the flip-flop induced spin bath fluctuations due to thermal electron-spin polarization. T2 saturates at approximately 250 micros below 2 K, where the polarization of the electron-spin bath exceeds 99%.
authors.affiliation: Department of Physics and Center for Terahertz Science and Technology, University of California, Santa Barbara, California 93106, USA. susumu@iqcd.ucsb.edu
authors.forename: Susumu
authors.initials: S
authors.lastname: Takahashi
authors.forename: Ronald
authors.initials: R
authors.lastname: Hanson
authors.forename: Johan
authors.initials: J
authors.lastname: van Tol
authors.forename: Mark S
authors.initials: MS
authors.lastname: Sherwin
authors.forename: David D
authors.initials: DD
authors.lastname: Awschalom