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Title: Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework

Abstract

Dichotomy between local spins and conjugated electrons spawns various exotic physical phenomena, however, it has mostly been reported in three-dimensional (3D) inorganic systems. We demonstrate, for the first time, that a rare 2D metal–organic framework exhibits intriguing dichotomy behavior, which can be directly identified through scanning tunneling microscopy/spectroscopy (STM/STS). In a newly synthesized Cu-hexaiminobenzene [Cu3(HAB)2], on the one hand, the Cu2+ ions form an ideal S–1/2 antiferromagnetic (AFM) kagome lattice; on the other hand, the conjugated-electrons from the organic ligands produce a frustrated πx,y model on a honeycomb lattice, giving rise to completely dispersionless energy bands around the Fermi level that favour the ferromagnetic (FM) state. Remarkably, the frustrated local spins and conjugated electrons interact through a strong FM Hund's coupling, giving rise to a wide range of intriguing quantum phases. Furthermore, we propose that this dichotomy can be directly characterized through STM/STS measurements due to its special 2D nature, which provides a unique exciting platform to investigate the dichotomy of frustrated spins and electrons in a single lattice.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5]
  1. Univ. of Utah, Salt Lake City, UT (United States); Univ. of Minnesota, Minneapolis, MN (United States)
  2. Tsinghua Univ., Beijing (China)
  3. Southern Univ. of Science and Technology, Shenzhen (China)
  4. Shandong Univ., Jinan (China)
  5. Univ. of Utah, Salt Lake City, UT (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
OSTI Identifier:
1543815
Alternate Identifier(s):
OSTI ID: 1487170
Grant/Contract Number:  
FG02-04ER46148; DMR-1121252; 11774196
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 11; Journal Issue: 3; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Chemistry; Science & Technology - Other Topics; Materials Science; Physics

Citation Formats

Jiang, Wei, Liu, Zheng, Mei, Jia-Wei, Cui, Bin, and Liu, Feng. Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework. United States: N. p., 2018. Web. doi:10.1039/c8nr08479c.
Jiang, Wei, Liu, Zheng, Mei, Jia-Wei, Cui, Bin, & Liu, Feng. Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework. United States. https://doi.org/10.1039/c8nr08479c
Jiang, Wei, Liu, Zheng, Mei, Jia-Wei, Cui, Bin, and Liu, Feng. Fri . "Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework". United States. https://doi.org/10.1039/c8nr08479c. https://www.osti.gov/servlets/purl/1543815.
@article{osti_1543815,
title = {Dichotomy between frustrated local spins and conjugated electrons in a two-dimensional metal–organic framework},
author = {Jiang, Wei and Liu, Zheng and Mei, Jia-Wei and Cui, Bin and Liu, Feng},
abstractNote = {Dichotomy between local spins and conjugated electrons spawns various exotic physical phenomena, however, it has mostly been reported in three-dimensional (3D) inorganic systems. We demonstrate, for the first time, that a rare 2D metal–organic framework exhibits intriguing dichotomy behavior, which can be directly identified through scanning tunneling microscopy/spectroscopy (STM/STS). In a newly synthesized Cu-hexaiminobenzene [Cu3(HAB)2], on the one hand, the Cu2+ ions form an ideal S–1/2 antiferromagnetic (AFM) kagome lattice; on the other hand, the conjugated-electrons from the organic ligands produce a frustrated πx,y model on a honeycomb lattice, giving rise to completely dispersionless energy bands around the Fermi level that favour the ferromagnetic (FM) state. Remarkably, the frustrated local spins and conjugated electrons interact through a strong FM Hund's coupling, giving rise to a wide range of intriguing quantum phases. Furthermore, we propose that this dichotomy can be directly characterized through STM/STS measurements due to its special 2D nature, which provides a unique exciting platform to investigate the dichotomy of frustrated spins and electrons in a single lattice.},
doi = {10.1039/c8nr08479c},
journal = {Nanoscale},
number = 3,
volume = 11,
place = {United States},
year = {Fri Nov 23 00:00:00 EST 2018},
month = {Fri Nov 23 00:00:00 EST 2018}
}

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Works referencing / citing this record:

Flat bands and nontrivial topological properties in an extended Lieb lattice
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