Heat transport study of the spin liquid candidate 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>TaS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Yu, Yijun; Xu, Yang; He, Lian; Kratochvílová, Marie; Huang, Yuzhen; Ni, Jingen; Wang, Lihai; Cheong, Sang‐Wook; Park, Je‐Geun; Li, S. Y.

doi:10.1103/physrevb.96.081111

Cited by 50 publications

(32 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S1 (b). In the star of David unit cell, as the outer twelve Ta atoms have displacement toward the centered Ta atom, the interatomic distance from the inner surrounding Ta atoms (labeled by 2-7) and outer surrounding Ta atoms (labeled by [8][9][10][11][12][13] to the centered Ta atom 1 shrink by 6.4% and 4.4% respectively. Since the hopping integral is scaled as R −5 with R the Ta-Ta distance [54], the atomic bonds within the star of David are therefore strengthened in the intra-cluster Hamiltonian H intra while other bonds are weakened in the inter-cluster Hamiltonian H inter .…”

Section: Effective Tight Binding Hamiltonian For the Star Of Davidmentioning

confidence: 99%

Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T−TaS2

Chen

et al. 2018

Phys. Rev. Lett.

View full text Add to dashboard Cite

1T-TaS_{2} is a cluster Mott insulator on the triangular lattice with 13 Ta atoms forming a star of David cluster as the unit cell. We derive a two-dimensional XXZ spin-1/2 model with a four-spin ring exchange term to describe the effective low energy physics of a monolayer 1T-TaS_{2}, where the effective spin-1/2 degrees of freedom arises from the Kramers degenerate spin-orbital states on each star of David. A large scale density matrix renormalization group simulation is further performed on this effective model and we find a gapless spin liquid phase with a spinon Fermi surface at a moderate to large strength region of the four-spin ring exchange term. All peaks in the static spin structure factor are found to be located on the "2k_{F}" surface of a half-filled spinon on the triangular lattice. Experiments to detect the spinon Fermi surface phase in 1T-TaS_{2} are discussed.

show abstract

Section: Effective Tight Binding Hamiltonian For the Star Of Davidmentioning

confidence: 99%

Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T−TaS2

Chen

et al. 2018

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…Remarkably, their combination can be found even in simple material systems, such as transition metal dichalcogenide (TMD) van der Waals compound 1T-TaS 2 . The ground state is a Mott insulator [1][2][3] with CDW [4] and unconventional quantum spin liquid behavior [5][6][7][8][9][10]. Upon Se substitution [11], Fe intercalation [12], or by applying pressure [13] it becomes superconducting, with both CDW and correlated behavior still present.…”

mentioning

confidence: 99%

Mottness collapse without metallization in the domain wall of the triangular-lattice Mott insulator1T−TaS2

2019

View full text Add to dashboard Cite

1T-TaS 2 is a charge-density-wave (CDW) compound with a Mott-insulating ground state. The metallic state obtained by doping, substitution or pulsed charge injection is characterized by an emergent CDW domain wall network, while single domain walls can be found in the pristine Mott state. Here we study whether and how the single walls become metallic. Tunneling spectroscopy reveals partial suppression of the Mott gap and the presence of in-gap states strongly localized at the domain-wall sites. Using the real-space dynamical mean field theory description of the strongly correlated quantum-paramagnet ground state we show that the local gap suppression follows from the increased hopping along the connected zigzag chain of lattice sites forming the domain wall, and that full metallisation is preempted by the splitting of the quasiparticle band into bonding and antibonding sub-bands due to the structural dimerization of the wall, explaining the presence of the in-gap states and the low density of states at the Fermi level.The interplay between superconductivity (SC) and correlated insulating phases, such as Mott insulators and charge density waves (CDW), is one of the central problems in condensed-matter physics. Remarkably, their combination can be found even in simple material systems, such as transition metal dichalcogenide (TMD) van der Waals compound 1T-TaS 2 . The ground state is a Mott insulator[1-3] with CDW[4] and unconventional quantum spin liquid behavior [5][6][7][8][9][10]. Upon Se substitution[11], Fe intercalation [12], or by applying pressure[13] it becomes superconducting, with both CDW and correlated behavior still present. Further control over electronic properties is possible through non-equilibrium charge injection via ultrafast optical or electrical pulses [14][15][16][17][18][19][20][21], which lead to drastic insulator to metastable metal transition. The long-standing hypothesis for metallisation and SC onset is linked to the formation of CDW domain walls, seen in multiple TMDs with different techniques [22][23][24]. Recently, it was challenged experimentally with scanning tunneling spectroscopy (STS) [25], which showed the absence of metallisation in certain types of walls. First-principles calculations revealed that atomic reconstruction in the walls may cause the formation of bound states[25] and band reconstruction [24], but the correlation effects were left out of scope. Thus, the crucial question of whether the CDW distortion inside the wall can lead to Mottness collapse remains open. In this paper we combine STS and dynamical mean field theory (DMFT) calculations to study the behavior of the Mott gap in CDW domain walls, finding Mottness collapse without metallisation.In 1T-TaS 2 , each layer is periodically modulated to form a √ 13 × √ 13 superlattice of David star deformations [4], resulting in a commensurate CDW state with a single half-filled electron band at the Fermi level [26,27]. The Coulomb repulsion opens a charge gap in this band, resulting in a Mott insulating ground state [2...

show abstract

“…In the second part of the paper, we have performed a similar analysis for the triangular-lattice Heisenberg model with exchange interactions up to third NNs, which is experimentally relevant as a low-energy description of various QSL candidate materials [71][72][73][74][75][76][77][78][79][85][86][87][88][89][90][91][92][93][94][95][96]. Motivated by a recent numerical study [97] indicating that this model can host a gapless spin-liquid phase with nonvanishing chiral spin correlations, we study two different ansätze, Eqs.…”

Section: Discussionmentioning

confidence: 99%

“…One of the most commonly studied examples of this type is the Heisenberg model on a triangular lattice. The physical importance of this simple model is paramount as sundry QSL candidates fall in the category of layered spin-1/2 triangular-lattice magnets, like the organic salts [71][72][73][74][75] and the transition metal dichalcogenides [76][77][78][79]. In all these materials, which belong to the family of weak Mott insulators with strong charge fluctuations [80][81][82][83][84], transport measurements hint at the existence of extensive mobile gapless spin excitations.…”

Section: Introductionmentioning

confidence: 99%

Unquantized thermal Hall effect in quantum spin liquids with spinon Fermi surfaces

Teng

Zhang

Samajdar

et al. 2020

Phys. Rev. Research

View full text Add to dashboard Cite

Recent theoretical studies have found quantum spin-liquid states with spinon Fermi surfaces upon the application of a magnetic field on a gapped state with topological order. We investigate the thermal Hall conductivity across this transition, describing how the quantized thermal Hall conductivity of the gapped state changes to an unquantized thermal Hall conductivity in the gapless spinon Fermi surface state. We consider two cases, both of potential experimental interest: the state with non-Abelian Ising topological order on the honeycomb lattice and the state with Abelian chiral spin-liquid topological order on the triangular lattice.

show abstract

Heat transport study of the spin liquid candidate 1T−TaS2

Cited by 50 publications

References 46 publications

Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T−TaS2

Spinon Fermi Surface in a Cluster Mott Insulator Model on a Triangular Lattice and Possible Application to 1T−TaS2

Mottness collapse without metallization in the domain wall of the triangular-lattice Mott insulator1T−TaS2

Unquantized thermal Hall effect in quantum spin liquids with spinon Fermi surfaces

Contact Info

Product

Resources

About