Intrinsic nature of chiral charge order in the kagome superconductor 
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Wang, Zhiwei; Jiang, Yu Xiao; Yin, Jia-Xin; Li, Yongkai; Wang, Guan Yong; Huang, Hai; Shao, Shen; Liu, Jinjin; Zhu, Peng; Shumiya, Nana; Hossain, Md. Shafayat; Liu, Hongxiong; Shi, Youguo; Duan, Junxi; Li, Xiang; Chang, Guoqing; Dai, Pengcheng; Ye, Zijin; Xu, Gang; Wang, Yanchao; Zheng, Hao; Jia, Jin‐Feng; Hasan, M. Zahid; Yao, Yugui

doi:10.1103/physrevb.104.035131

Cited by 139 publications

(87 citation statements)

References 27 publications

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“…In contrast to mostly independent amplitude modes and zonefolded modes in well-known CDW materials [46][47][48], we show that they hybridize strongly in CsV 3 Sb 5 , causing spectral weight redistribution to the latter and rendering them amplitude-mode-like. These CDW-induced modes are insensitive to magnetic fields, contrary to previous STM results on KV 3 Sb 5 [51] and RbV 3 Sb 5 [52]. The main lattice phonon parameters show clear anomalies in their temperature dependence, suggesting that electronphonon coupling is significant.…”

Section: Introductioncontrasting

confidence: 90%

“…The negligible field dependence observed here suggests that the charge orders are robust and do not show evidence of coupling with the applied magnetic field, consistent with a spin-polarized STM study [39]. These results are at odds with the field tunability of the CDW observed by STM in the sister compounds KV 3 Sb 5 [51] and RbV 3 Sb 5 [52], but another STM study found the field dependence to be absent in KV 3 Sb 5 [56]. More experiments are required to resolve this discrepancy.…”

Section: Magnetic-field Dependencesupporting

confidence: 78%

“…The pronounced temperature dependence of the CDWinduced modes discussed above demonstrates the high sensitivity of Raman scattering to the detailed characteristics of the CDW phase. We extend the technique to investigate the effects of a magnetic field on the CDW, motivated by the report of anomalous Hall effect concurrence with the CDW transition [18,32], the chiral nature of the CDW and its magnetic-field tunability [32,51,52], and the possible link to a hidden flux state that spontaneously breaks the time-reversal symmetry [38,55].…”

Section: Magnetic-field Dependencementioning

confidence: 99%

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Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Liu,

Ma,

et al. 2022

Preprint

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We report Raman scattering spectroscopy of the kagome metal CsV3Sb5 to investigate its chargedensity wave (CDW) phase. Temperature-dependent measurements reveal a multitude of CDWinduced modes, in agreement with density-functional theory calculations assuming the inverse Star of David lattice distortion. They are shown to be strongly hybridized amplitude modes and zonefolded modes, different from those in other known CDW materials. These CDW modes show negligible magnetic-field dependence and a signature of c-axis CDW modulation. Reducing the thickness to tens of nanometers dramatically enhances the change in the lattice phonon parameters across the CDW transition and strengthens its first-order character, indicating sizable electronphonon coupling. Further thickness reduction leads to destruction of the crystal lattice. Our results provide essential structural information to unravel the CDW mechanism in CsV3Sb5.

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Section: Introductioncontrasting

confidence: 90%

Section: Magnetic-field Dependencesupporting

confidence: 78%

Section: Magnetic-field Dependencementioning

confidence: 99%

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Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Liu,

Ma,

et al. 2022

Preprint

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“…2(c), which is ubiquitous for all AV 3 Sb 5 compounds. In defect-free areas of KV 3 Sb 5 and RbV 3 Sb 5 , the 2 × 2 charge order is found to display a chirality [28,29], where its three vector peaks have different intensities. We thus perform a spectroscopic map in a defect-free area [Fig.…”

Section: Transport and Tunneling Resultsmentioning

confidence: 99%

“…Kagome superconductors with competing orders have been identified for over 40 y [17][18][19], such as LaRu 3 Si 2 with T C of 7 K and a fundamental kagome band structure [20]. Recently, another layered kagome superconductor AV 3 Sb 5 (A = K, Rb, Cs) was discovered with T C up to 2.5 K for A = Cs [21][22][23], providing new research avenues, particularly for transport and scanning tunneling microscopy (STM) studies [21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5

et al. 2021

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Kagome superconductors with T C up to 7 K have been discovered for over 40 y. Recently, unconventional chiral charge order has been reported in kagome superconductor KV 3 Sb 5 , with an ordering temperature of one order of magnitude higher than the T C . However, the chirality of the charge order has not been reported in the cousin kagome superconductor CsV 3 Sb 5 , and the electronic nature of the chirality remains elusive. In this paper, we report the observation of electronic chiral charge order in CsV 3 Sb 5 via scanning tunneling microscopy (STM). We observe a 2 × 2 charge modulation and a 1 × 4 superlattice in both topographic data and tunneling spectroscopy. 2 × 2 charge modulation is highly anticipated as a charge order by fundamental kagome lattice models at van Hove filling, and is shown to exhibit intrinsic chirality. We find that the 1 × 4 superlattices form various small domain walls, and can be a surface effect as supported by our first-principles calculations. Crucially, we find that the amplitude of the energy gap opened by the charge order exhibits real-space modulations, and features 2 × 2 wave vectors with chirality, highlighting the electronic nature of the chiral charge order. STM study at 0.4 K reveals a superconducting energy gap with a gap size 2 = 0.85 meV, which estimates a moderate superconductivity coupling strength with 2 /k B T C = 3.9. When further applying a c-axis magnetic field, vortex core bound states are observed within this gap, indicative of clean-limit superconductivity.

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Modulations in Superconductors: Probes of Underlying Physics

et al. 2023

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development of various modulations techniques, breakthroughs in quantum materials are achieved, such as the quantum anomalous Hall effect (AHE) in topological insulators, [1][2][3][4] gate-tuned roomtemperature ferromagnetism in 2D van der Waals materials, [5][6][7][8] and emergent magnetic monopoles in artificial spin ice. [9] Especially, as the quantum materials of particular interest with zero dissipation, superconductors have been intensively studied with advanced modulations, aiming to reveal a plethora of emergent phenomena in condensed matter physics, such as superconductor-to-insulator transitions (SIT), [10][11][12] intermediate bosonic metallic state, [13] Bose-Einstein condensation (BEC)-Bardeen-Cooper-Schrieffer (BCS) crossover, [14,15] and intertwined orders, [16][17][18] as well as to develop applications in quantum computing [19][20][21] and ultrasensitive detections. [22][23][24] The superconductivity composes of two ingredients, including the Cooper pairs, each formed by two electrons, and phase coherence among Cooper pairs. [25] Superconductors such as metals and alloys are in the weak-coupling regime, which is well understood by BCS theory. [26,27] However, the later discovered superconductors, including cuprates, iron-based superconductors, and heavy-fermion superconductors, are strongly correlated systems, where a widely accepted microscopic mechanism yet remains absent. Therefore, various modulations have been utilized for the ultimate understanding of these superconductors and routines for room temperature superconductivity. Traditional modulations, such as elemental substitution, annealing, and polarization-induced gating are usually accompanied by some severe problems, including discontinuity, disorders, and limited ranges. Recently, state-of-the-art techniques have been developed with improved convenience, increased capability, and unprecedented dimensionalities, enabling more thorough investigations of unconventional superconductors.As a manifestation, we take some examples discussed in this review in advance. The carrier density can be tuned more conveniently and continuously. The techniques of ionic field-effect transistor (iFET) and electric double-layer transistor (EDLT) surpass conventional methods limited by solid solubility or dielectric breakdown, which enables the more precise phase diagram and detailed scaling analysis at the quantum phaseThe importance of modulations is elevated to an unprecedented level, due to the delicate conditions required to bring out exotic phenomena in quantum materials, such as topological materials, magnetic materials, and superconductors. Recently, state-of-the-art modulation techniques in material science, such as electric-double-layer transistor, piezoelectric-based strain apparatus, angle twisting, and nanofabrication, have been utilized in superconductors. They not only efficiently increase the tuning capability to the broader ranges but also extend the tuning dimensionality to unprecedented degrees of freedom, including quantum fluctuations of...

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Intrinsic nature of chiral charge order in the kagome superconductor RbV3Sb5

Cited by 139 publications

References 27 publications

Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5

Modulations in Superconductors: Probes of Underlying Physics

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