1. Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
2. Core Laboratories, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
3. Watt Research Lab, Central Research Institute, Huawei Technologies Co., Ltd., Bantian, Longgang District, Shenzhen 518129, China