Two Energy Gaps and Fermi-Surface "Arcs" in NbSe2
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
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
Originalsprache | Englisch |
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Aufsatznummer | 166402 |
Seitenumfang | 4 |
Fachzeitschrift | Physical review letters |
Jahrgang | 102 |
Ausgabenummer | 16 |
Publikationsstatus | Veröffentlicht - 24 Apr. 2009 |
Peer-Review-Status | Ja |
Extern publiziert | Ja |
Externe IDs
Scopus | 67650457559 |
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Schlagworte
Schlagwörter
- CHARGE-DENSITY-WAVE, TRANSITION-METAL DICHALCOGENIDES, DEPENDENT SUPERCONDUCTIVITY, 2H-NBSE2, 2H-TASE2, MECHANISM, STATE