Observation of a topological nodal surface and its surface-state arcs in an artificial acoustic crystal

Yang, Yihao; Xia, Jianping; Sun, Hong-xiang; Ge, Yong; Ding, Jia; Yuan, Shouqi; Yang, Shengyuan A.; Chong, Yidong; Zhang, Baile

doi:10.1038/s41467-019-13258-3

Cited by 79 publications

(51 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9b ) are scarce in photonics. Nodal surfaces carrying topological charge have been presented in condensed matter physics 175 – 177 and acoustics 178 , 179 , including a recent experimental demonstration. Theoretical predictions suggest that nonsymmorphic symmetries and ensure nodal surfaces at the BZ boundary 180 .…”

Section: Recent Progress In Topological Photonicsmentioning

confidence: 99%

Recent advances in 2D, 3D and higher-order topological photonics

2020

View full text Add to dashboard Cite

Over the past decade, topology has emerged as a major branch in broad areas of physics, from atomic lattices to condensed matter. In particular, topology has received significant attention in photonics because light waves can serve as a platform to investigate nontrivial bulk and edge physics with the aid of carefully engineered photonic crystals and metamaterials. Simultaneously, photonics provides enriched physics that arises from spin-1 vectorial electromagnetic fields. Here, we review recent progress in the growing field of topological photonics in three parts. The first part is dedicated to the basics of topological band theory and introduces various two-dimensional topological phases. The second part reviews three-dimensional topological phases and numerous approaches to achieve them in photonics. Last, we present recently emerging fields in topological photonics that have not yet been reviewed. This part includes topological degeneracies in nonzero dimensions, unidirectional Maxwellian spin waves, higher-order photonic topological phases, and stacking of photonic crystals to attain layer pseudospin. In addition to the various approaches for realizing photonic topological phases, we also discuss the interaction between light and topological matter and the efforts towards practical applications of topological photonics.

show abstract

Section: Recent Progress In Topological Photonicsmentioning

confidence: 99%

Recent advances in 2D, 3D and higher-order topological photonics

2020

View full text Add to dashboard Cite

show abstract

“…The topology of these FS degeneracies, which we refer to as topological protectorates (TPs), will be independent of material-specific details and, moreover, may be controlled by symmetry breaking. The putative existence of topological NPs has been studied in phononic metamaterials [18][19][20] , and mentioned in a study of non-magnetic chiral systems focusing on Kramers-Weyl fermions 21 .To demonstrate the formation of symmetry-enforced TPs at the intersection of NPs with the FS, we decided to study the ferromagnetic state of manganese silicide (MnSi), which has attracted great interest for its itinerant-electron magnetism 22 , helimagnetism, skyrmion lattice 23 and quantum phase transition 24 . Crystallizing in space group (SG) 198, MnSi is a magnetic sibling of non-magnetic RhSi (ref.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Symmetry-enforced topological nodal planes at the Fermi surface of a chiral magnet

Wilde

Dodenhöft

Niedermayr

et al. 2021

Nature

View full text Add to dashboard Cite

Despite recent efforts to advance spintronics devices and quantum information technology using materials with non-trivial topological properties, three key challenges are still unresolved1–9. First, the identification of topological band degeneracies that are generically rather than accidentally located at the Fermi level. Second, the ability to easily control such topological degeneracies. And third, the identification of generic topological degeneracies in large, multisheeted Fermi surfaces. By combining de Haas–van Alphen spectroscopy with density functional theory and band-topology calculations, here we show that the non-symmorphic symmetries10–17 in chiral, ferromagnetic manganese silicide (MnSi) generate nodal planes (NPs)11,12, which enforce topological protectorates (TPs) with substantial Berry curvatures at the intersection of the NPs with the Fermi surface (FS) regardless of the complexity of the FS. We predict that these TPs will be accompanied by sizeable Fermi arcs subject to the direction of the magnetization. Deriving the symmetry conditions underlying topological NPs, we show that the 1,651 magnetic space groups comprise 7 grey groups and 26 black-and-white groups with topological NPs, including the space group of ferromagnetic MnSi. Thus, the identification of symmetry-enforced TPs, which can be controlled with a magnetic field, on the FS of MnSi suggests the existence of similar properties—amenable for technological exploitation—in a large number of materials.

show abstract

“…The periodic structures with the Dirac point can present many interesting behaviors, e.g. carrier mobility 21 , zero refractive index [22][23][24][25] , Hall effect 26 and topological edge states [27][28][29][30] , etc. It should be mentioned that in the photonic crystal, the spatial phase can be reconstructed by the degenerate Bloch modes at the Dirac point 31 .…”

Section: Active Control On Topological Immunity Of Elastic Wave Metammentioning

confidence: 99%

Active control on topological immunity of elastic wave metamaterials

Wang

et al. 2020

Sci Rep

View full text Add to dashboard Cite

The topology concept in the condensed physics and acoustics is introduced into the elastic wave metamaterial plate, which can show the topological property of the flexural wave. The elastic wave metamaterial plate consists of the hexagonal array which is connected by the piezoelectric shunting circuits. The Dirac point is found by adjusting the size of the unit cell and numerical simulations are illustrated to show the topological immunity. Then the closing and breaking of the Dirac point can be generated by the negative capacitance circuits. These investigations denote that the topological immunity can be achieved for flexural wave in mechanical metamaterial plate. The experiments with the active control action are finally carried out to support the numerical design.

show abstract

Observation of a topological nodal surface and its surface-state arcs in an artificial acoustic crystal

Cited by 79 publications

References 40 publications

Recent advances in 2D, 3D and higher-order topological photonics

Recent advances in 2D, 3D and higher-order topological photonics

Symmetry-enforced topological nodal planes at the Fermi surface of a chiral magnet

Active control on topological immunity of elastic wave metamaterials

Contact Info

Product

Resources

About