Evolution of transport properties in FeSe thin flakes with thickness approaching the two-dimensional limit

C. S. Zhu, B. Lei, Z. L. Sun, J. H. Cui, M. Z. Shi, W. Z. Zhuo, X. G. Luo ∗ and X. H. Chen 2, 3, † Key Laboratory of Strongly Coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei National Laboratory for Physical Sciences at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei, Anhui 230026, China