Artificial heavy fermions in a van der Waals heterostructure

Vaňo, Viliam; Amini, Mohammad Reza; Ganguli, Somesh Chandra; Chen, Guangze; Lado, José L.; Kezilebieke, Shawulienu; Liljeroth, Peter

doi:10.1038/s41586-021-04021-0

Cited by 111 publications

(95 citation statements)

References 43 publications

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“…In addition, we perform the magnetic field dependent d I /d V measurements at 0.6 K. As shown in Fig. 3c , no clear splitting of the Kondo resonance peak is observed with external magnetic field up to 8.5 T. However, the Kondo resonance peak in the single layer 1 T -TaS 2 is clearly split with 10 T magnetic field 20 . The difference is that the width of Kondo resonance peak in Fig.…”

Section: Resultsmentioning

confidence: 92%

“…More surprisingly, the very recent study demonstrates that when the monolayer 1 T -TaS 2 is grown on the monolayer metallic 1 H -TaS 2 by molecular beam epitaxy, the Kondo resonance peak appears in the 1 T -TaS 2 layer 20 , which confirms the local moment formation and possible cluster Mott physics in the monolayer 1 T -TaS 2 . If the insulating gap of the Type-II surface in the bulk 1 T -TaS 2 is truly a Mott-insulating gap, there should be local magnetic moment formation that is similar as the monolayer 1 T -TaS 2 .…”

Section: Introductionmentioning

confidence: 74%

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Inducing and tuning Kondo screening in a narrow-electronic-band system

et al. 2022

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Although the single-impurity Kondo physics has already been well understood, the understanding of the Kondo lattice where a dense array of local moments couples to the conduction electrons is still far from complete. The ability of creating and tuning the Kondo lattice in non-f-electron systems will be great helpful for further understanding the Kondo lattice behavior. Here we show that the Pb intercalation in the charge-density-wave-driven narrow-electronic-band system 1T-TaS2 induces a transition from the insulating gap to a sharp Kondo resonance in the scanning tunneling microscopy measurements. It results from the Kondo screening of the localized moments in the 13-site Star-of-David clusters of 1T-TaS2. As increasing the Pb concentration, the narrow electronic band derived from the localized electrons shifts away from the Fermi level and the Kondo resonance peak is gradually suppressed. Our results pave the way for creating and tuning many-body electronic states in layered narrow-electronic-band materials.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 74%

Inducing and tuning Kondo screening in a narrow-electronic-band system

et al. 2022

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“…[4] Recently, localized spins have been observed in the charge density wave (CDW) superlattice of 1T-phase single-layer group-V TMDs materials, such as single-layer 1T-TaS2, 1T-TaSe2 and 1T-NbSe2, and the Kondo lattice emerges when they couple to the two-dimensional metallic layers. [5][6][7] Stacking the group-V TMDs layers hosting Kondo lattice with the two-dimensional superconductors would provide a new platform for exploring the interplay between superconductivity and Kondo lattice. 4Hb-TaS2 is a superconducting van der Waals material consisting of an alternate stacking of 1T-TaS2 and 1H-TaS2 layers [Fig.…”

mentioning

confidence: 99%

Coexistence of Quasi-two-dimensional Superconductivity and Tunable Kondo Lattice in a van der Waals Superconductor

Shen¹,

Gao²,

Wen³

et al. 2022

Chinese Phys. Lett.

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Realization of Kondo lattice in superconducting van der Waals materials not only provides a unique opportunity for tuning the Kondo lattice behavior by electrical gating or intercalation, but also is helpful for further understanding the heavy fermion superconductivity. Here we report a low-temperature and vector-magnetic-field scanning tunneling microscopy and spectroscopy study on a superconducting compound (4Hb-TaS2) with alternate stacking of 1T-TaS2 and 1H-TaS2 layers. We observe the quasi-two-dimensional superconductivity in the 1H-TaS2 layer with anisotropic response to the in-plane and out-of-plane magnetic fields. In the 1T-TaS2 layer, we detect the Kondo resonance peak that results from the Kondo screening of the unpaired electrons in the Star-of-David clusters. We also find the intensity of the Kondo resonance peak is sensitive to its relative position with the Fermi level, and it can be significantly enhanced when it’s further shifted towards the Fermi level by evaporating Pb atoms onto the 1T-TaS2 surface. Our results are not only important for fully understanding the electronic properties of 4Hb-TaS2, but also pave the way for creating tunable Kondo lattice in the superconducting van der Waals materials.

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“…We now elaborate on the material we will focus on in our discussion, 1T-TaS 2 . 1T-TaS 2 hosts a chargedensity-wave (CDW) instability leading to the formation of the Star-of-David (SOD) unit cell with 13 atoms at low temperature [23,[49][50][51][52]. The CDW as well as spinorbit coupling (SOC) result in a half-filled narrow band at the Fermi energy, with a bandwidth of a few 10meV [53].…”

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confidence: 99%

Controlling magnetic frustration in 1T-TaS$_2$ via Coulomb engineered long-range interactions

Chen¹,

Rösner²,

Lado³

2022

Preprint

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Magnetic frustrations in two-dimensional materials provide a rich playground to engineer unconventional phenomena such as non-collinear magnetic order and quantum spin-liquid behavior. However, despite intense efforts, a realization of tunable frustrated magnetic order in two-dimensional materials remains an open challenge. Here we propose Coulomb engineering as a versatile strategy to tailor magnetic ground states in layered materials. Using the proximal quantum spin-liquid candidate 1T-TaS2 as an example, we show how long-range Coulomb interactions renormalize the low energy nearly flat band structure, leading to a Heisenberg model which decisively depends on the Coulomb interactions. Based on this, we show that superexchange couplings in the material can be precisely tailored by means of environmental dielectric screening, ultimately allowing to externally drive the material towards the quantum spin-liquid regime. Our results put forward Coulomb engineering as a powerful tool to manipulate magnetic properties of van der Waals materials.

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Artificial heavy fermions in a van der Waals heterostructure

Cited by 111 publications

References 43 publications

Inducing and tuning Kondo screening in a narrow-electronic-band system

Inducing and tuning Kondo screening in a narrow-electronic-band system

Coexistence of Quasi-two-dimensional Superconductivity and Tunable Kondo Lattice in a van der Waals Superconductor

Controlling magnetic frustration in 1T-TaS$_2$ via Coulomb engineered long-range interactions

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