Impurity-induced resonant spinon zero modes in Dirac quantum spin liquids

Chen, Guangze; Lado, José L.

doi:10.1103/physrevresearch.2.033466

Cited by 18 publications

(7 citation statements)

References 94 publications

(126 reference statements)

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“…Second, since the screening is formed by deconfined and chargeless excitations rather than electrons, the characteristic resistivity behavior of conventional Kondo effect does not take place here. Third, the nature of fixed point can be manifested by thermal transport [16,47]. We have calculated the thermal conductivity σ E (T )/T at low energy scales near the AK fixed point based on the conformal field theory [8][9][10][11][12][13][14]51].…”

Section: Chernmentioning

confidence: 99%

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Emergent Kondo behavior from gauge fluctuations in spin liquids

Wang,

Zhao

et al. 2021

Preprint

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Kondo effect is a prominent quantum phenomenon describing the many-body screening of a local magnetic impurity. Here, we reveal a new type of non-magnetic Kondo behavior generated by gauge fluctuations in strongly-correlated baths. We show that a non-magnetic bond defect not only introduces the potential scattering but also locally enhances the gauge fluctuations. The local gauge fluctuations further mediate a pseudospin exchange interaction that produces an asymmetric Kondo fixed point in low-energy. The gauge-fluctuation-induced Kondo phenomena do not exhibit the characteristic resistivity behavior of conventional Kondo effect, but display a non-monotonous temperature dependence of thermal conductivity as well as an anisotropic pseudospin correlation. Moreover, with its origin from gauge fluctuations, the Kondo features can be regarded as promising indicators for identifying quantum spin liquids. Our work advances fundamental knowledge of novel Kondo phenomena in strongly-correlated systems, which have no counterparts in thermal baths within the single-particle description.

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Section: Chernmentioning

confidence: 99%

“…Because of the emergent gauge fluctuations, the impurity problems in QSLs are complicated, and thus have not been deeply investigated [15,16]. Indeed, there are many important questions to be answered, even if a nonmagnetic defect is considered.…”

mentioning

confidence: 99%

Emergent Kondo behavior from gauge fluctuations in spin liquids

Wang,

Zhao

et al. 2021

Preprint

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“…While natural QSL materials are rare and require very precise fine-tuning, engineered materials allow to drastically overcome such challenges. Interestingly, van der Waals QSL candidates such as TaS 2 [23][24][25] and TaSe 2 [26] provide versatile platforms for a variety of quantum engineering methods such as straining [27,28], twisting [29][30][31], impurity engineering [32][33][34] as well as Coulomb engineering, that could potentially drive them towards the QSL regime.…”

mentioning

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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“…We now move on to discuss how the impact of the exchange bias can be used for the detection of the spinon spectra. Scanning tunnel spectroscopy can be exploited to detect spin excitations by means of inelastic transport [9,10,91,92]. We now consider a similar setup, in which the magnetically encapsulated QSL bilayer is explored by means of vertical transport with STM as shown in Fig.…”

mentioning

confidence: 99%

“…From the experimental point of view, spinon states will emerge in the inelastic contribution to the current, and will appear as peaks in d 2 I/dV 2 when phonon contributions are neglected [93]. In such case, the measured d 2 I/dV 2 is proportional to the spin structure factor S(ω), the latter being a convolution of spinon DOS [92,94]:…”

mentioning

confidence: 99%

Tunable moire spinons in magnetically encapsulated twisted van der Waals quantum spin-liquids

Chen,

Lado

2021

Preprint

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Quantum spin-liquid van der Waals magnets such as TaS2, TaSe2, and RuCl3 provide a natural platform to explore new exotic phenomena associated with spinon physics, whose properties can be controlled by exchange proximity with ferromagnetic insulators such as CrBr3. Here we put forward a twisted van der Waals heterostructure based on a quantum spin-liquid bilayer encapsulated between ferromagnetic insulators. We demonstrate the emergence of spinon flat bands and topological spinon states in such heterostructure, where the emergence of a topological gap is driven by the twist. We further show that the spinon bandstructure can be controlled via exchange proximity effect to the ferromagnetic leads. We finally show how by combining small magnetic fields with tunneling spectroscopy, magnetically encapsulated heterostructures provide a way of characterizing the nature of the quantum spin-liquid state. Our results put forward twisted quantum spin-liquid bilayers as potential platforms for exotic moire spinon phenomena, demonstrating the versatility of magnetic van der Waals heterostructures.

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Impurity-induced resonant spinon zero modes in Dirac quantum spin liquids

Cited by 18 publications

References 94 publications

Emergent Kondo behavior from gauge fluctuations in spin liquids

Emergent Kondo behavior from gauge fluctuations in spin liquids

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

Tunable moire spinons in magnetically encapsulated twisted van der Waals quantum spin-liquids

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