Strongly enhanced charge-density-wave order in monolayer NbSe2.
By X. Xi, Liang Zhao, Zefang Wang, H. Berger, L. Forró, J. Shan, K. Mak. Nature Nanotechnology, 2015
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Two-dimensional materials possess very different properties from their bulk counterparts. While changes in single-particle electronic properties have been investigated extensively, modifications in the many-body collective phenomena in the exact two-dimensional limit remain relatively unexplored. Here, we report a combined optical and electrical transport study on the many-body collective-order phase diagram of NbSe2 down to a thickness of one monolayer. Both the charge density wave and the superconducting phase have been observed down to the monolayer limit. The superconducting transition temperature decreases on lowering the layer thickness, but the newly observed charge-density-wave transition temperature increases from 33 K in the bulk to 145 K in the monolayer. Such highly unusual enhancement of charge density waves in atomically thin samples can be understood to be a result of significantly enhanced electron-phonon interactions in two-dimensional NbSe2 (ref. 4) and is supported by the large blueshift of the collective amplitude vibration observed in our experiment. Our results open up a new window for search and control of collective phases of two-dimensional matter, as well as expanding the functionalities of these materials for electronic applications.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/8a13a7ec159b08a1afc66f10fea374e048db0520
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Citations in the corpus
- Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates (2018, background): “These include: (1) transitions from an indirect to a direct bandgap material1,2, thus opening new opportunities for optoelectronic applications13; (2) variations of many-body quantum criticalities, such as charge density wave (CDW)3,4 or supercondcuting5 transitions; and (3) field tunability of many”