Quantum friction controlled by plasmons between graphene sheets Tong-Biao Wang, Nian-Hua Liu, Jiang-Tao Liu and Tian-Bao Yu Eur. Phys. J. B, 87 8 (2014) 185 Published online: 11 August 2014 DOI: 10.1140/epjb/e2014-50072-x