Modulated Kondo screening along magnetic mirror twin boundaries in monolayer MoS2

Abstract

When a single electron is confined to an impurity state in a metal, a many-body resonance emerges at the Fermi energy if the electron bath screens the impurity’s magnetic moment. This is the Kondo effect, originally introduced to explain the abnormal resistivity behaviour in bulk magnetic alloys, and it has been realized in many quantum systems over the past decades, ranging from heavy-fermion lattices down to adsorbed single atoms. Here we describe a Kondo system that allows us to experimentally resolve the spectral function consisting of impurity levels and a Kondo resonance in a large Kondo temperature range, as well as their spatial modulation. Our approach is based on a discrete half-filled quantum confined state within a MoS2 grain boundary, which—in conjunction with numerical renormalization group calculations—enables us to test the predictive power of the Anderson model that is the basis of the microscopic understanding of Kondo physics.

Controllable Growth of 2D V3S5 Single Crystal by Chemical Vapor Deposition

“…As illustrated in Figure 5b, the resistance upturn remains up to 10 T magnetic field, indicating that the resistance upturn stems from the electron-electron interaction (EEI), [35] which is different from the previously reported properties in V x S y (Table S2, Supporting Information). [12][13][14][15][16][17][18] Meanwhile, a large and unsaturated negative magnetoresistance is observed in Figure 5c, which is also resulted from the EEI. [35] Figure 5d shows the Hall resistance as a function of the magnetic field at various temperatures.…”

“…[5][6][7][8] Among these strategies, intercalation method is regarded as an effective way to introduce novel physical properties that do not DOI: 10.1002/adfm.202308356 exist in intrinsic materials due to the tuned electronic structures. For example, the 2D intercalated TMCs such as Cr 1+x Te 2 , Nb 1+x S 2 , Ta x S(Se) y , and V x S y [3,[9][10][11][12][13][14][15][16] have been synthesized. Among them, V x S y family is typical intercalated 2D materials that exhibit various physical properties and hold great potential as promising candidates for spintronic devices.…”

“…However, the controllable synthesis of novel 2D self-intercalated V x S y compounds directly via CVD still remains a challenge, such as the predicted V 3 S 4 , V 5 S 8 , and V 3 S 5 . [15][16][17]19,20] Herein, a binary metal precursor co-reaction CVD method for the synthesis of self-intercalated vanadium chalcogenides is proposed, in which vanadium powder and VCl 3 powder are used as precursors to manipulate the vapor pressure of vanadium resource during the growth process. Therefore, the selfintercalated V 3 S 5 crystal was successfully synthesized.…”

“…Specifically, the high‐quality V 5 S 8 was precisely prepared by chemical vapor transport method and exhibits antiferromagnetic property with Néel temperature of 32 K. [ 17 ] The self‐intercalated V 9 S 16 and V 5 S 8+ x nanosheets have been synthesized by molecular beam epitaxy method, and the CDW transition was observed in these intercalated compounds. [ 15 ] Interestingly, the antiferromagnetic order in V 3 S 4 crystal has also been discovered. [ 16 ] Recently, the heterodimentional superlattice VS 2 ‐VS was produced by chemical vapor deposition (CVD) method and exhibits the room‐temperature in‐plane Hall effect.…”

“…However, the controllable synthesis of novel 2D self‐intercalated V x S y compounds directly via CVD still remains a challenge, such as the predicted V 3 S 4 , V 5 S 8 , and V 3 S 5 . [ 15–17,19,20 ]…”