Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 56: New materials and concepts

HL 56.5: Talk

Friday, March 16, 2018, 12:15–12:30, EW 202

Scanning tunneling microscopy study of an excitonic insulator candidate — •Xinglu Que^1,2, Lihui Zhou¹, Qingyu He^1,2, Tomohiro Takayama^1,2, Andreas Rost^1,2, and Hidenori Takagi^1,2 — ¹Max Planck Institute for Solid State Research, Stuttgart, Germany — ²Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Germany

An excitonic insulator is resulted from strong electron-hole coupling as compared to the single electron energy gap of a semiconductor or semimetal, where new exotic electronic phases have theoretically been predicted to emerge. I present our study of an excitonic insulator candidate by scanning tunneling microscopy. The surface topography as well as the electronic structure was investigated at different temperatures in ultrahigh vacuum. Our atomic resolution studies revealed a strong correlation of its electronic properties with the structure, laying the ground out for further study on physics of excitonic insulators.