Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 49, Pages 15054-15059Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1512092112
Keywords
two-dimensional materials; strongly correlated systems; charge density waves
Categories
Funding
- National Science Foundation Materials Research Science and Engineering Center program through Columbia in the Center for Precision Assembly of Superstratic and Superatomic Solids [DMR-1420634]
- Army Research Office [W911NF-14-1-0638]
- National Science Foundation Integrative Graduate Education and Research Traineeship [DGE-1069260]
- National Key Basic Research Contract [2011CBA00111]
- National Nature Science Foundation of China [11404342]
- National Natural Science Foundation of China [U1232139]
- Chinese Academy of Sciences' Large-Scale Scientific Facility Grant [U1232139]
- David and Lucile Packard Foundation
- National Science Foundation Materials Research Science and Engineering Center program [DMR-1120296]
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The layered transition metal dichalcogenides host a rich collection of charge density wave phases in which both the conduction electrons and the atomic structure display translational symmetry breaking. Manipulating these complex states by purely electronic methods has been a long-sought scientific and technological goal. Here, we show how this can be achieved in 1T-TaS2 in the 2D limit. We first demonstrate that the intrinsic properties of atomically thin flakes are preserved by encapsulation with hexagonal boron nitride in inert atmosphere. We use this facile assembly method together with transmission electron microscopy and transport measurements to probe the nature of the 2D state and show that its conductance is dominated by discommensurations. The discommensuration structure can be precisely tuned in few-layer samples by an in-plane electric current, allowing continuous electrical control over the discommensuration-melting transition in 2D.
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