Two Energy Gaps and Fermi-Surface "Arcs" in NbSe2
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Using angle-resolved photoemission spectroscopy, we report on the direct observation of the energy gap in 2H-NbSe2 caused by the charge-density waves (CDW). The gap opens in the regions of the momentum space connected by the CDW vectors, which implies a nesting mechanism of CDW formation. In remarkable analogy with the pseudogap in cuprates, the detected energy gap also exists in the normal state (T > T-0) where it breaks the Fermi surface into "arcs," it is nonmonotonic as a function of temperature with a local minimum at the CDW transition temperature (T-0), and it forestalls the superconducting gap by excluding the nested portions of the Fermi surface from participating in superconductivity.
Details
Original language | English |
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Article number | 166402 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 102 |
Issue number | 16 |
Publication status | Published - 24 Apr 2009 |
Peer-reviewed | Yes |
Externally published | Yes |
External IDs
Scopus | 67650457559 |
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Keywords
Keywords
- CHARGE-DENSITY-WAVE, TRANSITION-METAL DICHALCOGENIDES, DEPENDENT SUPERCONDUCTIVITY, 2H-NBSE2, 2H-TASE2, MECHANISM, STATE