Temperature-dependent electronic ground state charge transfer in van der Waals heterostructures

This work was funded by the Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 182087777 - SFB 951, AM 419/1-1, and by the JSPS KAKENHI Grant No. JP18H03904. Further support by the National Research Foundation (NRF) of Korea under Grant 2018M3D1A1058793 and Technology Innovation Program (20012502), funded by the Korean Ministry of Trade, industry & Energy, is acknowledged. We thank the IMS and HZB for allocating synchrotron radiation beam time (UVSOR, BL7U and Bessy II, PM4). H. W. thanks Karen Fidanyan for assistance with the phonon calculations.