DIAMOND · NV

LITA nitrogen-vacancy (NV) centre is a nitrogen atom beside an empty site in the diamond lattice. Its electron spin can be read with light at room temperature. In CVD diamond with ¹³C depleted to 0.3%, Balasubramanian et al. (Nature Materials 8, 383, 2009) measured a room-temperature spin-echo T₂ of 1.8 ms (other centres in the sample: 0.5–2 ms). Natural diamond is about 1.1% ¹³C. The nuclear spins of ¹³C are what make the electron forget.

MODELThe diamond cubic lattice turns in the void. White points are ¹²C (no nuclear spin), cyan flickers are ¹³C, and the red star is the NV. Purify with the slider. The echo curve uses the dilute-bath scaling T₂ ∝ 1/c(¹³C), anchored at 1.8 ms for 0.3%; it is a scaling, not a full cluster-expansion calculation. Drag to rotate.

¹³C fraction fire a spin echo

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