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Title: Orbital selectivity causing anisotropy and particle-hole asymmetry in the charge density wave gap of 2 H - TaS 2

Abstract

Here, we report an in-depth angle-resolved photoemission spectroscopy study on 2H–TaS 2, a canonical incommensurate charge density wave (CDW) system. This study demonstrates that just as in related incommensurate CDW systems, 2H–TaSe 2 and 2H–NbSe 2, the energy gap (Δ CDW) of 2H–TaS 2 is localized along the K-centered Fermi surface barrels and is particle-hole asymmetric. The persistence of Δ CDW even at temperatures higher than the CDW transition temperature T CDW in 2H–TaS 2, reflects the similar pseudogap behavior observed previously in 2H–TaSe 2 and 2H–NbSe 2. However, in sharp contrast to 2H–NbSe 2, where ΔCDW is nonzero only in the vicinity of a few “hot spots” on the inner K-centered Fermi surface barrels, Δ CDW in 2H–TaS 2 is nonzero along the entirety of both K-centered Fermi surface barrels. Based on a tight-binding model, we attribute this dichotomy in the momentum dependence and the Fermi surface specificity of Δ CDW between otherwise similar CDW compounds to the different orbital orientations of their electronic states that participate in the CDW pairing. Our results suggest that the orbital selectivity plays a critical role in the description of incommensurate CDW materials.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [1];  [4];  [5];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Amsterdam, Amsterdam (The Netherlands)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1411153
Alternate Identifier(s):
OSTI ID: 1378416
Grant/Contract Number:  
[AC02-06CH11357; FG02-01ER45927]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
[ Journal Volume: 96; Journal Issue: 12]; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhao, J., Wijayaratne, K., Butler, A., Yang, J., Malliakas, C. D., Chung, D. Y., Louca, D., Kanatzidis, M. G., van Wezel, J., and Chatterjee, U. Orbital selectivity causing anisotropy and particle-hole asymmetry in the charge density wave gap of 2H-TaS2. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.125103.
Zhao, J., Wijayaratne, K., Butler, A., Yang, J., Malliakas, C. D., Chung, D. Y., Louca, D., Kanatzidis, M. G., van Wezel, J., & Chatterjee, U. Orbital selectivity causing anisotropy and particle-hole asymmetry in the charge density wave gap of 2H-TaS2. United States. doi:10.1103/PhysRevB.96.125103.
Zhao, J., Wijayaratne, K., Butler, A., Yang, J., Malliakas, C. D., Chung, D. Y., Louca, D., Kanatzidis, M. G., van Wezel, J., and Chatterjee, U. Tue . "Orbital selectivity causing anisotropy and particle-hole asymmetry in the charge density wave gap of 2H-TaS2". United States. doi:10.1103/PhysRevB.96.125103. https://www.osti.gov/servlets/purl/1411153.
@article{osti_1411153,
title = {Orbital selectivity causing anisotropy and particle-hole asymmetry in the charge density wave gap of 2H-TaS2},
author = {Zhao, J. and Wijayaratne, K. and Butler, A. and Yang, J. and Malliakas, C. D. and Chung, D. Y. and Louca, D. and Kanatzidis, M. G. and van Wezel, J. and Chatterjee, U.},
abstractNote = {Here, we report an in-depth angle-resolved photoemission spectroscopy study on 2H–TaS2, a canonical incommensurate charge density wave (CDW) system. This study demonstrates that just as in related incommensurate CDW systems, 2H–TaSe2 and 2H–NbSe2, the energy gap (ΔCDW) of 2H–TaS2 is localized along the K-centered Fermi surface barrels and is particle-hole asymmetric. The persistence of ΔCDW even at temperatures higher than the CDW transition temperature TCDW in 2H–TaS2, reflects the similar pseudogap behavior observed previously in 2H–TaSe2 and 2H–NbSe2. However, in sharp contrast to 2H–NbSe2, where ΔCDW is nonzero only in the vicinity of a few “hot spots” on the inner K-centered Fermi surface barrels, ΔCDW in 2H–TaS2 is nonzero along the entirety of both K-centered Fermi surface barrels. Based on a tight-binding model, we attribute this dichotomy in the momentum dependence and the Fermi surface specificity of ΔCDW between otherwise similar CDW compounds to the different orbital orientations of their electronic states that participate in the CDW pairing. Our results suggest that the orbital selectivity plays a critical role in the description of incommensurate CDW materials.},
doi = {10.1103/PhysRevB.96.125103},
journal = {Physical Review B},
number = [12],
volume = [96],
place = {United States},
year = {2017},
month = {9}
}

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