期刊
SCIENCE ADVANCES
卷 4, 期 10, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aau5501
关键词
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资金
- U.S. Department of Energy, Basic Energy Sciences (BES) DMSE
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4540, GBMF3848]
- U.S. Department of Energy BES SUF Division Accelerator and Detector RD program
- LCLS Facility
- SLAC [DE-AC02-05-CH11231, DE-AC02-76SF00515]
- Gordon and Betty Moore Foundation, under the EPiQS Initiative [GBMF4303]
Domain walls (DWs) are singularities in an ordered medium that often host exotic phenomena such as charge ordering, insulator-metal transition, or superconductivity. The ability to locally write and erase DWs is highly desirable, as it allows one to design material functionality by patterning DWs in specific configurations. We demonstrate such capability at room temperature in a charge density wave (CDW), a macroscopic condensate of electrons and phonons, in ultrathin 1T-TaS2. A single femtosecond light pulse is shown to locally inject or remove mirror DWs in the CDW condensate, with probabilities tunable by pulse energy and temperature. Using time-resolved electron diffraction, we are able to simultaneously track anti-synchronized CDW amplitude oscillations from both the lattice and the condensate, where photoinjected DWs lead to a red-shifted frequency. Our demonstration of reversible DW manipulation may pave new ways for engineering correlated material systems with light.
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