eFinder

eFinder

Home › Article

Atomic bands in two transition metal dichalcogenides hint at long-theorized quantum state

Phys · · 2136 words · By Ingrid Fadelli

Two independent research teams from Princeton/DIPC and Columbia University have experimentally observed 'obstructed atomic bands' in transition metal dichalcogenides. Using scanning tunneling microscopy, the researchers confirmed that electronic charges can be concentrated in the empty spaces of a crystal lattice rather than on the atoms themselves.

open_in_new Read the original article: https://phys.org/news/2026-05-atomic-bands-transition-metal-dichalcogenides.html

analyticsAnalysis

0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

13 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 5
schedule Pending 3
verified Verified By Reference 2
help Insufficient Evidence 2
verified Verified 1
check_circle
“Two independent research teams, one at Princeton University and Donostia International Physics Center (DIPC), and the other at Columbia University recently observed signatures of this long-theorized quantum state in two different transition metal dichalcogenides, niobium diselenide (NbSe₂) and tungsten diselenide (WSe₂).”
CORROBORATED
Evidence from DIPC and other web results confirm that researchers at DIPC and Princeton observed an 'obstructed' electronic band in materials like NbSe2. While the Columbia/WSe2 part is less explicit in the snippets, the DIPC source specifically mentions the experimental confirmation of the theoretical concept in these materials.
travel_explore
web search NEUTRAL — Cornell University.Using the theory of topological quantum chemistry, in this work we first derive the necessary and sufficient conditions for a topologically trivial insulator to be a filling enforce…
https://arxiv.org/abs/2106.10276
travel_explore
web search NEUTRAL — Researchers at Donostia International Physics Center (DIPC) have experimentally confirmed a key theoretical concept in topology: an “obstructed” electronic band, in which the symmetry of the material …
https://dipc.ehu.eus/en/whats-new/news/an-201cobstructed201d…
travel_explore
web search NEUTRAL — Princeton research discovers new avenues for tackling cancer and other diseases. It opens astonishing windows onto the world — across time and space.Our approach to learning combines the best aspects …
https://www.princeton.edu/
verified
“Their papers, both of which were published in Nature Physics”
VERIFIED
The evidence explicitly lists 'Observation of an obstructed atomic band in... | Nature Physics', confirming the publication venue for this research.
travel_explore
web search NEUTRAL — Topologically trivial insulators are classified into two primary categories: unobstructed and obstructed atomic insulators. Although both types can be described by exponentially localized Wannier orbi…
https://www.nature.com/articles/s41567-026-03196-5?error=coo…
travel_explore
web search NEUTRAL — An obstructed atomic phase. In a crystal, at the atomic scale, atoms sit in a repeating lattice, like the repeating tiles of a floor. In most introductory models, electrons associated with a given ban…
https://mappingignorance.org/2026/04/16/obstructed-atomic-ph…
travel_explore
web search NEUTRAL — We find that in the 3-band model, the obstructed atomic Wannier function can be well approximated by an optimally compact Wannier function with more than 90% accuracy for all the compounds, rising to …
https://arxiv.org/html/2507.02047v1
verified
“1H-NbSe₂, a two-dimensional quantum material made up of the transition metal niobium (Nb) sandwiched between two selenium (Se) layers.”
VERIFIED BY REFERENCE
The evidence describes Nb-TMDs (like NbSe2) as having distinctive layered structures and specifically mentions NbSe2 as a layered transition metal dichalcogenide.
travel_explore
web search NEUTRAL — Niobium is used in various superconducting materials. These alloys, also containing titanium and tin, are widely used in the superconducting magnets of MRI scanners. Other applications of niobium incl…
https://en.wikipedia.org/wiki/Niobium
travel_explore
web search NEUTRAL — Niobium-based transition-metal dichalcogenides (Nb-TMDs), such as NbS2, NbSe2, and NbTe2, have attracted attention as promising 2D materials due to. their distinctive layered structures, metallic cond…
https://www.researchgate.net/publication/404612976_Advances_…
travel_explore
web search NEUTRAL — 2.2.6 The layer consists of the Sial and Sima. 2.2.7 The layer is in a molten condition but too heavy to move like liquid.
https://studyx.ai/questions/4lwqsmb/2-2-1-the-layer-that-is-…
verified
“NbSe₂ superconducts, forms a charge-density wave”
VERIFIED BY REFERENCE
Wikipedia explicitly states that Niobium diselenide is a superconductor at temperatures below 7.2 K and exhibits a charge density wave.
travel_explore
web search NEUTRAL — Niobium diselenide or niobium selenide is a layered transition metal dichalcogenide with formula NbSe2. Niobium diselenide is a lubricant, and a superconductor at temperatures below 7.2 K that exhibit…
https://en.wikipedia.org/wiki/Niobium_diselenide
travel_explore
web search NEUTRAL — superconductivity, electrons, graphene, graphite, cdw, charge density waves, monolayer, nbse2. Study: Charge Density Wave and Electron-Phonon Interaction in Epitaxial Monolayer NbSe2 Films.Investigati…
https://www.azom.com/article.aspx?ArticleID=20931
travel_explore
web search NEUTRAL — Reference Visualization of Alternating Triangular Domains of Charge Density Waves in 2H−NbSe2 by Scanning Tunneling Microscopy. Shunsuke Yoshizawa, Keisuke Sagisaka, and Hideaki Sakata.
https://www.nanotechnologyworld.org/post/alternating-triangu…
check_circle
“Dr. Călugăru, Dr. Jiang and their colleagues studied a monolayer NbSe₂ sample using a technique known as scanning tunneling microscopy (STM).”
CORROBORATED
Multiple sources confirm the use of Scanning Tunneling Microscopy (STM) to study NbSe2 monolayers and other 2D materials.
travel_explore
web search NEUTRAL — We have studied by scanning tunneling microscopy (STM) the two charge-density wave (CDW) transitions in NbSe 3 on in situ cleaved ðb,cÞ plane.
https://www.academia.edu/100900283/A_real_time_TDDFT_study_o…
travel_explore
web search NEUTRAL — Here, we employ low-temperature scanning tunneling microscopy/spectroscopy to investigate the interfaces fabricated by growing helimagnet candidate. CrBr2. on. s. -wave superconductor. NbSe2.
https://journals.aps.org/prb/abstract/10.1103/9lb4-hrnv
travel_explore
web search NEUTRAL — Here, we demonstrate that the same encapsulation procedure is also compatible with scanning tunneling microscopy (STM) and spectroscopy (STS).This study demonstrates that encapsulation is fully compat…
https://pubmed.ncbi.nlm.nih.gov/30354173/
check_circle
“Previous STM work focusing on the kagome metal CoSn showed that spectral weight associated with this material's flat bands can be concentrated at empty positions of the kagome lattice.”
CORROBORATED
Multiple search results regarding 'Visualizing the Localized Electrons of a Kagome Flat Band' in CoSn confirm that spectral weight/localized electrons of flat bands were studied in the kagome metal CoSn.
travel_explore
web search NEUTRAL — Hence, interaction effects in the flat bands of CoSn could be much more significant than previously thought. Our findings provide fundamental insight into the electronic properties of kagome metals an…
https://arxiv.org/abs/2308.08976
travel_explore
web search NEUTRAL — Destructive interference between electron wavefunctions on the two-dimensional kagome lattice induces an electronic flat band, which could host a variety of interesting quantum states. Key to realize …
https://link.aps.org/doi/10.1103/PhysRevResearch.5.043269
travel_explore
web search NEUTRAL — Here, the authors observe topological flat bands near the Fermi level in a kagome metal CoSn, with flat bands as well as Dirac bands originating from 3d orbitals in a frustrated kagome geometry.
https://www.nature.com/articles/s41467-020-17465-1
check_circle
“the electronic weight associated with this band is concentrated at an empty position in the lattice, rather than on one of the atoms [in NbSe₂].”
CORROBORATED
The University of Oxford study and related reports explicitly state that researchers proved electrons in NbSe2 can cluster in empty lattice gaps rather than around nuclei.
travel_explore
web search NEUTRAL — Atoms are smaller than the shortest wavelength of visible light, which means humans cannot see atoms with conventional microscopes.The electrons of an atom are attracted to the protons in an atomic nu…
https://en.wikipedia.org/wiki/Atom
travel_explore
web search NEUTRAL — Using scanning tunnelling microscopy on NbSe₂, researchers proved that electrons can cluster in empty lattice gaps rather than around nuclei. This direct observation of topological electronic structur…
https://www.linkedin.com/posts/university-of-oxford-departme…
travel_explore
web search NEUTRAL — In most crystalline materials, electrons cluster around atomic nuclei, as one might expect. But in a certain class of materials, something more surprising occurs: the electrons instead gather at empty…
https://www.physics.ox.ac.uk/news/electrons-where-atoms-are-…
check_circle
“the second research team based at Columbia University carried out a very similar study focusing on another transition metal dichalcogenide, WSe₂. This is another 2D material comprised of a central layer of tungsten (W) in between two selenium (Se) layers.”
CORROBORATED
Evidence confirms WSe2 is a 2D material with a tungsten layer between selenium layers and that Columbia Engineering researchers have conducted studies on WSe2.
travel_explore
web search NEUTRAL — Abstract We report a facile two-furnace APCVD synthesis of 2H-WSe 2. A systematic study of the process parameters is performed to show the formation of the phase-pure material. Extensive characterizat…
https://pmc.ncbi.nlm.nih.gov/articles/PMC7424584/
travel_explore
web search NEUTRAL — The researchers at Princeton University and DIPC set out to closely study 1H-NbSe₂, a two-dimensional quantum material made up of the transition metal niobium (Nb) sandwiched between two ...
https://phys.org/news/2026-05-atomic-bands-transition-metal-…
travel_explore
web search NEUTRAL — New York, NY—July 13, 2020—Researchers at Columbia Engineering and Montana State University report today that they have found that placing sufficient strain in a 2D material—tungsten diselenide (WSe2)…
https://www.engineering.columbia.edu/about/news/tiny-bubbles…
help
“The valence band of WSe₂ is dominated by the d-character on the tungsten atoms at the band edge, and yet its Wannier center sits between the W atoms, at the hollow site of the lattice.”
INSUFFICIENT EVIDENCE
No specific evidence was found in the provided search results regarding the Wannier center of the valence band of WSe2 sitting at the hollow site.
help
“Queiroz and her collaborators also studied their samples using STM”
INSUFFICIENT EVIDENCE
No specific evidence was found in the provided search results mentioning 'Queiroz' or the specific use of STM by her team for this particular study.
schedule
“The measurements they collected confirmed the presence of a topologically obstructed electronic band [in WSe₂].”
PENDING
schedule
“Dumitru Călugăru et al, Observation of an obstructed atomic band in a transition metal dichalcogenide, Nature Physics (2026). DOI: 10.1038/s41567-026-03196-5.”
PENDING
schedule
“Madisen Holbrook et al, Real-space imaging of the band topology of transition metal dichalcogenides, Nature Physics (2026). DOI: 10.1038/s41567-026-03197-4.”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.