Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film
Abstract
© 2016 American Physical Society. The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in both cuprates and iron-based superconductors. The origin of nematicity and its possible tie to the pairing mechanism of high-Tc, however, still remain controversial. Here, we study the electronic structure of a multilayer FeSe film using angle-resolved photoemission spectroscopy. The band reconstruction in the nematic state is clearly delineated. We find that the energy splitting between dxz and dyz bands shows a nonmonotonic distribution in momentum space. From the Brillouin zone center to the Brillouin zone corner, the magnitude of splitting first decreases, then increases, and finally reaches the maximum value of ~70 meV. Moreover, besides the dxz and dyz bands, band splitting was also observed on the dxy bands with a comparable energy scale around 45 meV. Our results suggest that the electronic anisotropy in the nematic state cannot be explained by a simple on-site ferro-orbital order. Instead, strong anisotropy exists in the hopping of all dxz,dyz, and dxy orbitals, the origin of which holds the key to a microscopic understanding of the nematicity in iron-based superconductors.
- Authors:
-
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Stanford Univ., CA (United States). Dept. of Physics and Dept. of Applied Physics
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
- National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan); Japan Science and Technology Agency (JST), Tokyo (Japan)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1377500
- Alternate Identifier(s):
- OSTI ID: 1326699; OSTI ID: 1393078
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 11; 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
Zhang, Y., Yi, M., Liu, Z. -K., Li, W., Lee, J. J., Moore, R. G., Hashimoto, M., Nakajima, M., Eisaki, H., Mo, S. -K., Hussain, Z., Devereaux, T. P., Shen, Z. -X., and Lu, D. H. Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.94.115153.
Zhang, Y., Yi, M., Liu, Z. -K., Li, W., Lee, J. J., Moore, R. G., Hashimoto, M., Nakajima, M., Eisaki, H., Mo, S. -K., Hussain, Z., Devereaux, T. P., Shen, Z. -X., & Lu, D. H. Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film. United States. https://doi.org/10.1103/PhysRevB.94.115153
Zhang, Y., Yi, M., Liu, Z. -K., Li, W., Lee, J. J., Moore, R. G., Hashimoto, M., Nakajima, M., Eisaki, H., Mo, S. -K., Hussain, Z., Devereaux, T. P., Shen, Z. -X., and Lu, D. H. Mon .
"Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film". United States. https://doi.org/10.1103/PhysRevB.94.115153. https://www.osti.gov/servlets/purl/1377500.
@article{osti_1377500,
title = {Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film},
author = {Zhang, Y. and Yi, M. and Liu, Z. -K. and Li, W. and Lee, J. J. and Moore, R. G. and Hashimoto, M. and Nakajima, M. and Eisaki, H. and Mo, S. -K. and Hussain, Z. and Devereaux, T. P. and Shen, Z. -X. and Lu, D. H.},
abstractNote = {© 2016 American Physical Society. The nematic state, where a system is translationally invariant but breaks rotational symmetry, has drawn great attention recently due to the experimental observations of such a state in both cuprates and iron-based superconductors. The origin of nematicity and its possible tie to the pairing mechanism of high-Tc, however, still remain controversial. Here, we study the electronic structure of a multilayer FeSe film using angle-resolved photoemission spectroscopy. The band reconstruction in the nematic state is clearly delineated. We find that the energy splitting between dxz and dyz bands shows a nonmonotonic distribution in momentum space. From the Brillouin zone center to the Brillouin zone corner, the magnitude of splitting first decreases, then increases, and finally reaches the maximum value of ~70 meV. Moreover, besides the dxz and dyz bands, band splitting was also observed on the dxy bands with a comparable energy scale around 45 meV. Our results suggest that the electronic anisotropy in the nematic state cannot be explained by a simple on-site ferro-orbital order. Instead, strong anisotropy exists in the hopping of all dxz,dyz, and dxy orbitals, the origin of which holds the key to a microscopic understanding of the nematicity in iron-based superconductors.},
doi = {10.1103/PhysRevB.94.115153},
journal = {Physical Review B},
number = 11,
volume = 94,
place = {United States},
year = {Mon Sep 26 00:00:00 EDT 2016},
month = {Mon Sep 26 00:00:00 EDT 2016}
}
Web of Science
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