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Title: Ultrafast manipulation of mirror domain walls in a charge density wave

Journal Article · · Science Advances

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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
Gordon and Betty Moore Foundation (United States); National Science Foundation (NSF) (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1490444
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 10 Vol. 4; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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Ultrafast Relativistic Electron Nanoprobes journal May 2019
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Charge density wave dynamics in nonvolatile current-induced phase transition in 1 T − Ta S 2 journal October 2019
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Excitation and Relaxation Dynamics of the Photo-Perturbed Correlated Electron System 1T-TaS2 journal December 2018
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Intertwined chiral charge orders and topological stabilization of the light-induced state of a prototypical transition metal dichalcogenide text January 2017
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