Thermal Dynamics of Charge Density Wave Pinning in 
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Liu, Limin; Zhu, Changjiang; Liu, Z. Y.; Deng, Huanguang; Zhou, Xiaoxia; Li, Yuan; Sun, Yaohong; Huang, Xiong; Li, Shuaishuai; Du, Xin; Wang, Zheng; Guan, Tianwang; Mao, Hong; Sui, Yu; Wu, Rui; Yin, Jiaxin; Cheng, Jinguang; Pan, S. H.

doi:10.1103/physrevlett.126.256401

Cited by 18 publications

(9 citation statements)

References 34 publications

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“…The reverse relationship can also be stated: observation of κ/κ 0 increasing to a maximum of 2 inside the gap identifies the origin of the gap as being most likely due to superconductivity. This is particularly important for a broad array of new emerging materials 26,27 as well as confined geometries of nanowires and nanoparticles, 28 where superconducting states are sought but competing ordered states, for example, charge density wave, can manifest instead. Theoretical modeling of NCAR was carried out with tightbinding simulations.…”

Section: T H Imentioning

confidence: 99%

“…Even in a conventional s-wave Pb superconductor, mapping NCAR signal revealed enhancement of Andreev reflection at single atomic steps, providing a powerful method to image current carrying excitations at the atomic scale. In the future, this technique can be readily extended to the emerging families of unconventional and topological superconductors, ,,, providing new insight into superconducting states and their localized excitations. For example, we anticipate that both NCAR and NeCAR spectra will be significantly different between nodal and fully gapped superconducting states, providing direct and complementary insight into order parameter symmetry.…”

mentioning

confidence: 99%

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Noncontact Andreev Reflection as a Direct Probe of Superconductivity on the Atomic Scale

Lado

Maksymovych

2022

Nano Lett.

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Direct detection of superconductivity has long been a key strength of point-contact Andreev reflection. However, its applicability to atomic-scale imaging is limited by the mechanical contact of the Andreev probe. To this end, we present a new method to probe Andreev reflection in a tunnel junction, leveraging tunneling spectroscopy and junction tunability to achieve quantitative detection of Andreev scattering. This method enables unambiguous assignment of superconducting origins of current-carrying excitations, as well as detection of higher order Andreev processes in atomic-scale junctions. We furthermore revealed distinct sensitivity of Andreev reflection to natural defects, such as step edges, even in classical superconductors. The methodology opens a new path to nano-and atomic-scale imaging of superconducting properties, including disordered superconductors and proximity to phase transitions.

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Section: T H Imentioning

confidence: 99%

mentioning

confidence: 99%

Noncontact Andreev Reflection as a Direct Probe of Superconductivity on the Atomic Scale

Lado

Maksymovych

2022

Nano Lett.

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“…The reverse relationship can also be stated -observation of κ/κ 0 increasing to a maximum of 2 inside the gap identifies the origin of the gap as being most likely due to superconductivity. This is particularly important for a broad array of new emerging materials [26,27] as well as confined geometries of nanowires and nanoparticles [28], where superconducting states are sought but competing ordered states, e.g. charge density wave, can manifest instead.…”

mentioning

confidence: 99%

“…Even in conventional s-wave Pb superconductor, mapping NCAR signal exhibited enhancement of Andreev reflection at single atomic steps, providing a powerful method to image current carrying excitations at the atomic scale. In the future, this technique can be readily extended to the emerging families of unconventional and topological superconductors [8,10,26,27], providing new and complementary insight into superconducting states and their localized excitations. Ultimately, our technique can allow probing the nature of current-carrying unconventional excitations in correlated quantum materials, ranging from Yu-Shiba-Rusinov states [39,40] to fractionalized many-body excitations [12,41].…”

mentioning

confidence: 99%

Non-contact Andreev reflection as a direct probe of superconductivity on the atomic scale

Ko,

Lado,

Maksymovych

2022

Preprint

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Direct detection of superconductivity has long been a key strength of point-contact Andreev reflection. However, its applicability to atomic-scale imaging is limited by the mechanical contact of the Andreev probe. To this end, we present a new method to probe Andreev reflection in a tunnel junction, leveraging tunneling spectroscopy and junction tunability to achieve quantitative detection of Andreev scattering. This method enables unambiguous assignment of superconducting origins of current-carrying excitations as well as detection of higher order Andreev processes in atomic-scale junctions. We furthermore revealed distinct sensitivity of Andreev reflection to natural defects, such as step edges, even in classical superconductors. The methodology opens a new path to nanoand atomic-scale imaging of superconducting properties, including disordered superconductors and proximity to phase transitions.

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“…Note that compared to the theories involving Weyl physics [14,15], our theory does not require spin-orbit coupling and is focused on a larger energy scale. We also expect our theory to be implementable in other quasi-1D CDW materials [27][28][29][30][31][32] such as TaTe 4 where desired CDW patterns on specific surfaces have been reported [33,34].…”

mentioning

confidence: 99%

Two-dimensional sliding charge density waves and their protected edge modes

Zhang¹,

Hossain²,

Yin³

et al. 2022

Preprint

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We propose and study a two-dimensional (2D) charge density waves (CDW) phase, which is constructed from an array of weakly coupled one-dimensional (1D) sliding CDW wires whose phases shift from one wire to the next. We show that the fully gapped bulk CDW has topological properties, characterized by a nonzero Chern number, that imply protected edge modes within the bulk gap. The edge modes exhibit spectral pseudo-flow as a function of position along the edge, and are thus dual to chiral edge modes of Chern insulators with their spectral flow in momentum space. Furthermore, we show that these sliding CDW edge modes are stable against small inter-wire coupling. Our predictions can be tested experimentally in quasi-1D CDW compounds such as Ta2Se8I.

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Thermal Dynamics of Charge Density Wave Pinning in ZrTe3

Cited by 18 publications

References 34 publications

Noncontact Andreev Reflection as a Direct Probe of Superconductivity on the Atomic Scale

Noncontact Andreev Reflection as a Direct Probe of Superconductivity on the Atomic Scale

Non-contact Andreev reflection as a direct probe of superconductivity on the atomic scale

Two-dimensional sliding charge density waves and their protected edge modes

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