Tom Bridgeland, Stability conditions on triangulated categories, Ann. of Math. 166 (2007) 317–345 math.AG/0212237

Tom Bridgeland, An introduction to motivic Hall algebra, arXiv:1002.4372 A realization of (Drinfeld-Jimbo) quantum groups via a “Bridgeland” version of twisted Hall algebra?,

Tom Bridgeland, Quantum groups via Hall algebras of complexes, Ann of Math 177 (2) (2013) 739–759