Depolarization dynamics in a strongly interacting solid-state spin   ensemble
  We study the depolarization dynamics of a dense ensemble of dipolar interacting spins, associated with nitrogen-vacancy centers in diamond. We observe anomalously fast, density-dependent, and non-exponential spin relaxation. To explain these observations, we propose a microscopic model where an interplay of long-range interactions, disorder, and dissipation leads to predictions that are in quantitative agreement with both current and prior experimental results. Our results pave the way for controlled many-body experiments with long-lived and strongly interacting ensembles of solid-state spins. 
Joonhee Choi, Soonwon Choi, Georg Kucsko, Peter C. Maurer, Brendan J.   Shields, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoy...
quant-ph cond-mat.dis-nn cond-mat.mes-hall cond-mat.stat-mech cond-mat.str-el