TY - JOUR AU - Chen, Jwo-Sy AU - Brewer, Samuel AU - Hume, David AU - Chou, Chin-Wen AU - Wineland, David AU - Leibrandt, David 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 -