Reversible structure manipulation by tuning carrier concentration in metastable Cu2S

Jing Tao, Jingyi Chen, Jun Li, Leanne Mathurin, Jin Cheng Zheng, Yan Li, Deyu Lu, Yue Cao, Lijun Wu, Robert Joseph Cava, Yimei Zhu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The optimal functionalities of materials often appear at phase transitions involving simultaneous changes in the electronic structure and the symmetry of the underlying lattice. It is experimentally challenging to disentangle which of the two effects––electronic or structural––is the driving force for the phase transition and to use the mechanism to control material properties. Here we report the concurrent pumping and probing of Cu2S nanoplates using an electron beam to directly manipulate the transition between two phases with distinctly different crystal symmetries and charge-carrier concentrations, and show that the transition is the result of charge generation for one phase and charge depletion for the other. We demonstrate that this manipulation is fully reversible and nonthermal in nature. Our observations reveal a phase-transition pathway in materials, where electron-induced changes in the electronic structure can lead to a macroscopic reconstruction of the crystal structure.

Original languageEnglish (US)
Pages (from-to)9832-9837
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number37
DOIs
StatePublished - Sep 12 2017

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • CuS
  • Electron-beam–radiation effects
  • Phase transition
  • Structure manipulation

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