Unveiling the orbital texture of 1T-TiTe2 using intrinsic linear dichroism in multidimensional photoemission spectroscopy

Beaulieu, Samuel; Schüler, Michael; Schusser, Jakub; Dong, Shuo; Pincelli, Tommaso; Maklar, Julian; Neef, Alexander; Reinert, F.; Wolf, Martin; Rettig, Laurenz; Minář, J.; Ernstorfer, Ralph

doi:10.1038/s41535-021-00398-3

Cited by 31 publications

(21 citation statements)

References 69 publications

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“…* tarik.cysne@gmail.com Theoretical calculations predict the existence of the orbital textures that give origin to the OHE in many 2D multiorbital materials [30][31][32][33]. In addition, recent experiments confirmed the existence of these textures for some of these 2D materials [34][35][36]. Among many 2D materials, the family of transition metal dichalcogenides (TMDs) has attracted prominent interest.…”

Section: Introductionmentioning

confidence: 99%

Orbital Hall effect in bilayer transition metal dichalcogenides: From the intra-atomic approximation to the Bloch states orbital magnetic moment approach

Cysne,

Bhowal,

Vignale

et al. 2022

Preprint

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Section: Introductionmentioning

confidence: 99%

Orbital Hall effect in bilayer transition metal dichalcogenides: From the intra-atomic approximation to the Bloch states orbital magnetic moment approach

Cysne,

Bhowal,

Vignale

et al. 2022

Preprint

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“…In studying the momentum-space characterization of the few-particle exciton complexes like biexcitons, trions [9,120,121] , or their moiré equivalents [114,115,127] , one can directly unveil the valley configuration of the constituent electrons and holes, as well as deducing their spatial distribution relative to each other. Moreover, one can follow their formation, decay, and dissociation dynamics, and address questions regarding the interactions leading to their stable formation, as opposed to the processes of screening, dissociation, or Auger-type recombination.…”

Section: Middle Row: Manifestations Of Many-exciton Interactions: Exc...mentioning

confidence: 99%

Through the Lens of a Momentum Microscope: Viewing Light‐Induced Quantum Phenomena in 2D Materials

2022

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Van der Waals (vdW) materials at their two-dimensional limit are diverse, flexible, and unique laboratories to study fundamental quantum phenomena and their future applications. Their novel properties rely on their pronounced Coulomb interactions, variety of crystal symmetries and spinphysics, and the ease of incorporation of different vdW materials to form sophisticated heterostructures. In particular, the excited state properties of many two-dimensional semiconductors and semi-metals are relevant for their technological applications, particularly those that can be induced by light. In this paper, we review the recent advances made in studying out-of-equilibrium, light-induced, phenomena in these materials using powerful, surface-sensitive, time-resolved photoemission-based techniques, with a particular emphasis on the emerging multi-dimensional photoemission spectroscopy technique of time-resolved momentum microscopy. We discuss the advances this technique has enabled in studying the nature and dynamics of occupied excited states in these materials. Then, we project for the future research directions opened by these scientific and instrumental advancements, studying the physics of two-dimensional materials and the opportunities to engineer their band-structure and band-topology by laser fields.

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“…Theoretical calculations predict the existence of orbital-textures in some 2D materials, which can give rise to the OHE [17,18,26,27]. These textures have been observed in insulating TMDs [28,29], where calculations revealed an OHE plateau [17][18][19][20]. Furthermore, it is possible to attribute an orbital Chern number to this insulating phase [19,20], indicating a connection with nontrivial topology.…”

Section: Introductionmentioning

confidence: 99%

Connecting Higher-Order Topology with the Orbital Hall Effect in Monolayers of Transition Metal Dichalcogenides

Costa¹,

Focassio²,

Cysne³

et al. 2022

Preprint

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Monolayers of transition metal dichalcogenides (TMDs) in the 2H structural phase have been recently classified as higher-order topological insulators (HOTI), protected by C3 rotation symmetry. In addition, theoretical calculations show an orbital Hall plateau in the insulating gap of TMDs, characterized by an orbital Chern number. We explore the correlation between these two phenomena in TMD monolayers in two structural phases: the noncentrosymmetric 2H and the centrosymmetric 1T. Using density functional theory, we confirm the characteristics of 2H-TMDs and reveal that 1T-TMDs are identified by a Z4 topological invariant. As a result, when cut along appropriate directions, they host conducting edge-states, which cross their bulk energy-band gaps and can transport orbital angular momentum. Our linear response calculations thus indicate that the HOTI phase is accompanied by an orbital Hall effect. Using general symmetry arguments, we establish a connection between the two phenomena with potential implications for spin-orbitronics.

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Unveiling the orbital texture of 1T-TiTe2 using intrinsic linear dichroism in multidimensional photoemission spectroscopy

Cited by 31 publications

References 69 publications

Orbital Hall effect in bilayer transition metal dichalcogenides: From the intra-atomic approximation to the Bloch states orbital magnetic moment approach

Orbital Hall effect in bilayer transition metal dichalcogenides: From the intra-atomic approximation to the Bloch states orbital magnetic moment approach

Through the Lens of a Momentum Microscope: Viewing Light‐Induced Quantum Phenomena in 2D Materials

Connecting Higher-Order Topology with the Orbital Hall Effect in Monolayers of Transition Metal Dichalcogenides

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