Two-dimensional chiral stacking orders in quasi-one-dimensional charge density waves

Kim, Sun Woo; Kim, Hyun Jung; Cheon, Sangmo; Kim, So Yeon

doi:10.1103/physrevb.102.121408

Cited by 5 publications

(4 citation statements)

References 54 publications

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“…While a non-chiral soliton is very mobile to hinder the STM observation, chiral solitons are well trapped by pinning defects or tend to aggregate into a 2D domain wall due to the interwire interaction 7 , 27 . An STM image for a cluster of solitons and defects crossing three In wires are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Topological soliton molecule in quasi 1D charge density wave

Im,

Song,

Park

et al. 2023

Nat Commun

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Soliton molecules, bound states of two solitons, can be important for the informatics using solitons and the quest for exotic particles in a wide range of physical systems from unconventional superconductors to nuclear matter and Higgs field, but have been observed only in temporal dimension for classical wave optical systems. Here, we identify a topological soliton molecule formed spatially in an electronic system, a quasi 1D charge density wave of indium atomic wires. This system is composed of two coupled Peierls chains, which are endowed with a Z4 topology and three distinct, right-chiral, left-chiral, and non-chiral, solitons. Our scanning tunneling microscopy measurements identify a bound state of right- and left-chiral solitons with distinct in-gap states and net zero phase shift. Our density functional theory calculations reveal the attractive interaction of these solitons and the hybridization of their electronic states. This result initiates the study of the interaction between solitons in electronic systems, which can provide novel manybody electronic states and extra data-handling capacity beyond the given soliton topology.

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Section: Resultsmentioning

confidence: 99%

“…S3) 20 – 24 , 28 . Each of these defects 28 pins a left-chiral soliton (indicated by green bars and green dashed circles) 7 , 27 . The combination of a defect and a chiral soliton results in a total π phase shift (a translation by a 0 = 0.384 nm, the lattice constant of Si) of CDW as indicated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Topological soliton molecule in quasi 1D charge density wave

Im,

Song,

Park

et al. 2023

Nat Commun

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“…Note that within a single (4×2) unit cell, the trimers can be placed in four different arrangements. Introducing alternating trimer placements be- tween neighbouring (4×2) wires, the periodicity perpendicular to the wire direction can be extended to (8×2) or (16×2) translational symmetries 8 . Subsequently, a shear movement of the trimerized In zigzag chains against each other completes the transition into the CDW state 7,18 .…”

Section: Resultsmentioning

confidence: 99%

“…In this context, the ordered atomic wire array formed at the Si(111)-(4×1)/(8×2)In surface 6 is a particularly popular model system. It features a triple-band Peierls transition into a quasi one-dimensional (1D) charge density wave (CDW) ordered ground state with (8×2) translational symmetry 7,8 . Solitons have been intensively in-vestigated in this system 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Dual nature of localized phase defects in the In/Si(111) atomic wire array: impurities and short topological solitons

Razzaq¹,

Song²,

Kim³

et al. 2020

Preprint

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We demonstrate the existence of atomically-sized topological solitons in a quasi one-dimensional charge density wave system: indium atomic wires on Si(111). Performing joint scanning tunneling microscopy and density-functional calculations, we show that the Si( 111)-(8×2)In surface features two conceptually different types of abrupt phase flip structures. One is caused by In adatoms and is, hence, non-solitonic in nature. The other one is an abrupt left-chiral soliton.

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Defect-induced solitons in double Peierls chain model

Han

Kang

Cheon

2021

J. Korean Phys. Soc.

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The generation and manipulation of topological solitons are of great importance in fundamental and practical aspects. Recently, chiral solitons and their topological operations have been experimentally discovered in the double Peierls chains of an indium atomic wire on a silicon substrate. Here, we theoretically study the role of defects at edges as generators of topological chiral solitons in the double Peierls chain model composed of two Su-Schrieffer-Heeger chains with interchain coupling. We classify four types of defects according to the combination of strong or weak defects in each chain. Two strong defects at an edge remain stable and do not generate a soliton. Interestingly, two weak defects at an edge generate a non-chiral soliton, while a weak defect in a chain and a strong defect in the other generate either a right-chiral or left-chiral soliton. Our work opens a pathway to generate and manipulate topological solitons in various one-dimensional systems.

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Two-dimensional chiral stacking orders in quasi-one-dimensional charge density waves

Cited by 5 publications

References 54 publications

Topological soliton molecule in quasi 1D charge density wave

Topological soliton molecule in quasi 1D charge density wave

Dual nature of localized phase defects in the In/Si(111) atomic wire array: impurities and short topological solitons

Defect-induced solitons in double Peierls chain model

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