Electric Field-Tuned Electronic Structure Revealed by Time- and Angle-Resolved Photoemission Spectroscopy

External electric field can easily modify the electronic structure of materials and create novel or useful quantum states. Such electric field tunable electronic structure is difficult to be probed by angle-resolved photoemission spectroscopy (ARPES) experiment because the electric field will deflect the photoelectrons. Here I will present our experimental results on electric field-tunable electronic structure by using a new strategy which can obtain the transient electronic structure under a tunable electric field, based on time- and angle-resolved photoemission spectroscopy (TrARPES).