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  1. Article ; Online: Materials science: Chemistry and physics happily wed.

    Fiete, Gregory A

    Nature

    2017  Volume 547, Issue 7663, Page(s) 287–288

    Language English
    Publishing date 2017--19
    Publishing country England
    Document type News ; Comment
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/547287a
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  2. Book ; Online: Photogalvanic response in multi-Weyl semimetals

    Raj, Arpit / Chaudhary, Swati / Fiete, Gregory A.

    2023  

    Abstract: We investigate the dependence of the photogalvanic response of a multi-Weyl semimetal on its topological charge, tilt, and chemical potential. We derive analytical expressions for the shift and injection conductivities for tilted charge-$n$ Weyl points $( ...

    Abstract We investigate the dependence of the photogalvanic response of a multi-Weyl semimetal on its topological charge, tilt, and chemical potential. We derive analytical expressions for the shift and injection conductivities for tilted charge-$n$ Weyl points $(n=1,2,3)$ using a low energy two-band effective Hamiltonian. For double-Weyl semimetals, we also compute the response from two-band and four-band tight-binding models with broken time-reversal symmetry to study the effect of band bending and the contributions from higher bands. We find a significant deviation in the responses obtained from the effective low-energy continuum model and more realistic four-band continuum and tight-binding models. We analyze several different limits of these models. We describe the nature of the deviations and provide estimates of their dependence on the frequency and other model parameters. Our analysis provides a simple explanation for the first-principle calculation based frequency dependence of the injection current in SrSi$_2$. Additionally, we find interesting parameter regimes where the frequency dependence of the non-linear optical response can be directly used to probe the type-I/type-II nature of the Weyl cone. We obtain analytical results for the charge-4 Weyl semimetal by reducing the original problem involving a triple $k$-space integral to one with only a double integral. This simplification allows us to extract all relevant information about the nature of its second-order dc response and the precise condition for observing circular photogalvanic effect quantization. The semi-analytical approach presented here can also be extended to a systematic study of second harmonic generation and first-order optical conductivity in charge-4 Weyl semimetals.

    Comment: 16 pages, 7 figures, references added, typos corrected
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics
    Subject code 621 ; 539
    Publishing date 2023-03-22
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Book ; Online: Dzyaloshinskii-Moriya Induced Topological Magnon-Phonon Hybridization in 2D Antiferromagnetic Insulators with Tunable Chern Numbers

    Ma, Bowen / Fiete, Gregory A.

    2021  

    Abstract: We theoretically study magnon-phonon hybrid excitations (magnon-polarons) in two-dimensional antiferromagnets on a honeycomb lattice. With an in-plane Dzyaloshinskii-Moriya interaction (DMI) allowed from mirror symmetry breaking from phonons, we find non- ...

    Abstract We theoretically study magnon-phonon hybrid excitations (magnon-polarons) in two-dimensional antiferromagnets on a honeycomb lattice. With an in-plane Dzyaloshinskii-Moriya interaction (DMI) allowed from mirror symmetry breaking from phonons, we find non-trivial Berry curvature around the anti-crossing rings among magnon and both optical and acoustic phonon bands, which gives rise to finite Chern numbers. We show that the Chern numbers of the magnon-polaron bands can be manipulated by changing the magnetic field direction or strength. We evaluate the thermal Hall conductivity reflecting the non-trivial Berry curvatures of magnon-polarons and propose a valley Hall effect resulting from spin-induced chiral phonons as a possible experimental signature. Our study complements prior work on magnon-phonon hybridized systems without optical phonons and suggests possible applications in spin caloritronics with topological magnons and chiral phonons.
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
    Subject code 539
    Publishing date 2021-07-23
    Publishing country us
    Document type Book ; Online
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  4. Article ; Online: Erratum: Topological Magnon Bands and Unconventional Superconductivity in Pyrochlore Iridate Thin Films [Phys. Rev. Lett. 118, 177201 (2017)].

    Laurell, Pontus / Fiete, Gregory A

    Physical review letters

    2018  Volume 121, Issue 1, Page(s) 19901

    Abstract: This corrects the article DOI: 10.1103/PhysRevLett.118.177201. ...

    Abstract This corrects the article DOI: 10.1103/PhysRevLett.118.177201.
    Language English
    Publishing date 2018-08-21
    Publishing country United States
    Document type Journal Article ; Published Erratum
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.121.019901
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  5. Article ; Online: Topological Magnon Bands and Unconventional Superconductivity in Pyrochlore Iridate Thin Films.

    Laurell, Pontus / Fiete, Gregory A

    Physical review letters

    2017  Volume 118, Issue 17, Page(s) 177201

    Abstract: We theoretically study the magnetic properties of pyrochlore iridate bilayer and trilayer thin films grown along the [111] direction using a strong coupling approach. We find the ground state magnetic configurations on a mean field level and carry out a ... ...

    Abstract We theoretically study the magnetic properties of pyrochlore iridate bilayer and trilayer thin films grown along the [111] direction using a strong coupling approach. We find the ground state magnetic configurations on a mean field level and carry out a spin-wave analysis about them. In the trilayer case the ground state is found to be the all-in-all-out (AIAO) state, whereas the bilayer has a deformed AIAO state. For all parameters of the spin-orbit coupled Hamiltonian we study, the lowest magnon band in the trilayer case has a nonzero Chern number. In the bilayer case we also find a parameter range with nonzero Chern numbers. We calculate the magnon Hall response for both geometries, finding a striking sign change as a function of temperature. Using a slave-boson mean-field theory we study the doping of the trilayer system and discover an unconventional time-reversal symmetry broken d+id superconducting state. Our study complements prior work in the weak coupling limit and suggests that the [111] grown thin film pyrochlore iridates are a promising candidate for topological properties and unconventional orders.
    Language English
    Publishing date 2017-04-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.118.177201
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  6. Article: Topological insulators: Crystalline protection.

    Fiete, Gregory A

    Nature materials

    2012  Volume 11, Issue 12, Page(s) 1003–1004

    Language English
    Publishing date 2012-11-23
    Publishing country England
    Document type Comment ; News
    ZDB-ID 2088679-2
    ISSN 1476-4660 ; 1476-1122
    ISSN (online) 1476-4660
    ISSN 1476-1122
    DOI 10.1038/nmat3473
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  7. Article ; Online: Spin-resolved topology and partial axion angles in three-dimensional insulators.

    Lin, Kuan-Sen / Palumbo, Giandomenico / Guo, Zhaopeng / Hwang, Yoonseok / Blackburn, Jeremy / Shoemaker, Daniel P / Mahmood, Fahad / Wang, Zhijun / Fiete, Gregory A / Wieder, Benjamin J / Bradlyn, Barry

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 550

    Abstract: Symmetry-protected topological crystalline insulators (TCIs) have primarily been characterized by their gapless boundary states. However, in time-reversal- ([Formula: see text]-) invariant (helical) 3D TCIs-termed higher-order TCIs (HOTIs)-the boundary ... ...

    Abstract Symmetry-protected topological crystalline insulators (TCIs) have primarily been characterized by their gapless boundary states. However, in time-reversal- ([Formula: see text]-) invariant (helical) 3D TCIs-termed higher-order TCIs (HOTIs)-the boundary signatures can manifest as a sample-dependent network of 1D hinge states. We here introduce nested spin-resolved Wilson loops and layer constructions as tools to characterize the intrinsic bulk topological properties of spinful 3D insulators. We discover that helical HOTIs realize one of three spin-resolved phases with distinct responses that are quantitatively robust to large deformations of the bulk spin-orbital texture: 3D quantum spin Hall insulators (QSHIs), "spin-Weyl" semimetals, and [Formula: see text]-doubled axion insulator (T-DAXI) states with nontrivial partial axion angles indicative of a 3D spin-magnetoelectric bulk response and half-quantized 2D TI surface states originating from a partial parity anomaly. Using ab-initio calculations, we demonstrate that β-MoTe
    Language English
    Publishing date 2024-01-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-44762-w
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  8. Article ; Online: Spin-orbit exciton-induced phonon chirality in a quantum magnet.

    Lujan, David / Choe, Jeongheon / Chaudhary, Swati / Ye, Gaihua / Nnokwe, Cynthia / Rodriguez-Vega, Martin / He, Jiaming / Gao, Frank Y / Nunley, T Nathan / Baldini, Edoardo / Zhou, Jianshi / Fiete, Gregory A / He, Rui / Li, Xiaoqin

    Proceedings of the National Academy of Sciences of the United States of America

    2024  Volume 121, Issue 11, Page(s) e2304360121

    Abstract: The interplay of charge, spin, lattice, and orbital degrees of freedom in correlated materials often leads to rich and exotic properties. Recent studies have brought new perspectives to bosonic collective excitations in correlated materials. For example, ...

    Abstract The interplay of charge, spin, lattice, and orbital degrees of freedom in correlated materials often leads to rich and exotic properties. Recent studies have brought new perspectives to bosonic collective excitations in correlated materials. For example, inelastic neutron scattering experiments revealed non-trivial band topology for magnons and spin-orbit excitons (SOEs) in a quantum magnet CoTiO
    Language English
    Publishing date 2024-03-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2304360121
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  9. Article ; Online: Physics. How do you want that insulator?

    Fiete, Gregory A

    Science (New York, N.Y.)

    2011  Volume 332, Issue 6029, Page(s) 546–547

    Language English
    Publishing date 2011-04-29
    Publishing country United States
    Document type Comment ; Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1205251
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  10. Article ; Online: Influence of Nanosize Hole Defects and their Geometric Arrangements on the Superfluid Density in Atomically Thin Single Crystals of Indium Superconductor.

    Liu, Mengke / Nam, Hyoungdo / Kim, Jungdae / Fiete, Gregory A / Shih, Chih-Kang

    Physical review letters

    2021  Volume 127, Issue 12, Page(s) 127003

    Abstract: Using Indium sqrt[7]×sqrt[3] on Si(111) as an atomically thin superconductor platform, and by systematically controlling the density of nanohole defects (nanometer size voids), we reveal the impacts of defect density and defect geometric arrangements on ... ...

    Abstract Using Indium sqrt[7]×sqrt[3] on Si(111) as an atomically thin superconductor platform, and by systematically controlling the density of nanohole defects (nanometer size voids), we reveal the impacts of defect density and defect geometric arrangements on superconductivity at macroscopic and microscopic length scales. When nanohole defects are uniformly dispersed in the atomic layer, the superfluid density monotonically decreases as a function of defect density (from 0.7% to 5% of the surface area) with minor change in the transition temperature T_{C}, measured both microscopically and macroscopically. With a slight increase in the defect density from 5% to 6%, these point defects are organized into defect chains that enclose individual two-dimensional patches. This new geometric arrangement of defects dramatically impacts the superconductivity, leading to the total disappearance of macroscopic superfluid density and the collapse of the microscopic superconducting gap. This study sheds new light on the understanding of how local defects and their geometric arrangements impact superconductivity in the two-dimensional limit.
    Language English
    Publishing date 2021-10-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.127.127003
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