TY - JOUR AU - Jwo-Sy Chen AU - Samuel Brewer AU - David Hume AU - Chin-Wen Chou AU - David Wineland AU - David Leibrandt C2 - Physics Review Letters DA - 2017-02-03 LA - en PB - Physics Review Letters PY - 2017 TI - Sympathetic Ground State Cooling and Time-dilation Shifts in an 27Al+ Optical Clock UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921576 ER -