Evidence for an Excitonic Insulator State in Ta2Pd3Te5 Jierui Huang ,1,2,*Bei Jiang ,1,2,*Jingyu Yao,1,2,*Dayu Yan,1,2,*Xincheng Lei,1,2,*Jiacheng Gao,1,2Zhaopeng Guo,1 Feng Jin,1Yupeng Li,1Zhenyu Yuan,1,2Congcong Chai,1,2Haohao Sheng,1,2Mojun Pan,1,2Famin Chen,1,2Junde Liu,1,2 Shunye Gao,1,2Gexing Qu,1,2Bo Liu,1,2Zhicheng Jiang,3Zhengtai Liu,3Xiaoyan Ma,1,2Shiming Zhou,4Yaobo Huang,3 Chenxia Yun,1Qingming Zhang,1,5Shiliang Li,1,2,6Shifeng Jin,1,2Hong Ding,7,8Jie Shen,1,?Dong Su,1,2,? Youguo Shi...