Revealing Hidden Orbital Pseudospin Texture with Time-Reversal Dichroism in Photoelectron Angular Distributions

Beaulieu, Samuel; Schusser, Jakub; Dong, Shuo; Schüler, Michael; Pincelli, Tommaso; Dendzik, Maciej; Maklar, Julian; Neef, Alexander; Ebert, H.; Hricovíni, K.; Wolf, Martin; Braun, Jürgen; Rettig, Laurenz; Minář, J.; Ernstorfer, Ralph

doi:10.1103/physrevlett.125.216404

Cited by 67 publications

(65 citation statements)

References 41 publications

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“…In general, the phase of the excitonic wave function might additionally be reconstructed through iterative phase retrieval algorithms [35]. We envision that future developments will allow retrieving the phase as well as orbital information of excitonic wave functions by utilizing dichroic observables [36][37][38] in trARPES.…”

Section: Momentum-and Real-space Distribution Of a Excitonsmentioning

confidence: 99%

Direct measurement of key exciton properties: Energy, dynamics, and spatial distribution of the wave function

et al. 2021

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Excitons, Coulomb‐bound electron–hole pairs, are the fundamental excitations governing the optoelectronic properties of semiconductors. Although optical signatures of excitons have been studied extensively, experimental access to the excitonic wave function itself has been elusive. Using multidimensional photoemission spectroscopy, we present a momentum‐, energy‐, and time‐resolved perspective on excitons in the layered semiconductor WSe2. By tuning the excitation wavelength, we determine the energy–momentum signature of bright exciton formation and its difference from conventional single‐particle excited states. The multidimensional data allow to retrieve fundamental exciton properties like the binding energy and the exciton–lattice coupling and to reconstruct the real‐space excitonic distribution function via Fourier transform. All quantities are in excellent agreement with microscopic calculations. Our approach provides a full characterization of the exciton properties and is applicable to bright and dark excitons in semiconducting materials, heterostructures, and devices. Key points The full life cycle of excitons is recorded with time‐ and angle‐resolved photoemission spectroscopy. The real‐space distribution of the excitonic wave function is visualized. Direct measurement of the exciton‐phonon interaction.

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Section: Momentum-and Real-space Distribution Of a Excitonsmentioning

confidence: 99%

Direct measurement of key exciton properties: Energy, dynamics, and spatial distribution of the wave function

et al. 2021

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“…Therefore, disentangling extrinsic and intrinsic contributions is of capital importance to access the additional information encoded in the photoemission matrix elements. Important examples include gaining insights into the orbital character of the electronic band structure in solids [17][18][19][20][21] , the chirality of charge carriers 22,23 , quantum geometric properties, such as orbital pseudospin texture 24,25 as well as Berry curvature [26][27][28][29] . The orbital texture in TMDCs is very sensitive to the lattice structure and collective effects such as charge density waves (CDW) [30][31][32][33][34] and the debated excitonic insulator state [35][36][37] .…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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The momentum-dependent orbital character in crystalline solids, referred to as orbital texture, is of capital importance in the emergence of symmetry-broken collective phases, such as charge density waves as well as superconducting and topological states of matter. By performing extreme ultraviolet multidimensional angle-resolved photoemission spectroscopy for two different crystal orientations linked to each other by mirror symmetry, we isolate and identify the role of orbital texture in photoemission from the transition metal dichalcogenide 1T-TiTe2. By comparing our experimental results with theoretical calculations based on both a quantitative one-step model of photoemission and an intuitive tight-binding model, we unambiguously demonstrate the link between the momentum-dependent orbital orientation and the emergence of strong intrinsic linear dichroism in the photoelectron angular distributions. Our results represent an important step towards going beyond band structure (eigenvalues) mapping and learning about electronic wavefunction and orbital texture of solids by exploiting matrix element effects in photoemission spectroscopy.

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“…Introduction.-The orbital Hall effect (OHE) is the orbital analog of the spin Hall effect and consists in the appearance of a transverse current of orbital angular momentum that is induced by a longitudinally applied electric field [1]. Recently, a renewed interest in orbital magnetism and other orbital effects [2][3][4][5] gave origin to various theoretical studies on the OHE and related phenomena [6][7][8][9][10][11][12][13][14][15]. The possibility of using the OHE to generate orbital torque in magnetic materials [16,17] motivated new experimental works on orbital dynamics in magnetic multilayers [18,19], raising expectations that orbital angular degrees of freedom may eventually be employed to process information in logic and memory devices.…”

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“…The interrelation between the OHE and the presence of orbital textures in reciprocal space [10] has been established and characterized both theoretically and experimentally in several low-dimensional materials [5,6,12,13,20,21], widening the class of systems that may be utilized for orbitronic applications. More specifically, the occurrence of a relatively large OHE has been predicted in the 2H structural phase of transition metal dichalcogenide (TMD) monolayers [6,7], where it is associated with the presence of a Dresselhaus-like orbital texture around the valleys [6].…”

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confidence: 99%

Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides

et al. 2021

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Revealing Hidden Orbital Pseudospin Texture with Time-Reversal Dichroism in Photoelectron Angular Distributions

Cited by 67 publications

References 41 publications

Direct measurement of key exciton properties: Energy, dynamics, and spatial distribution of the wave function

Direct measurement of key exciton properties: Energy, dynamics, and spatial distribution of the wave function

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

Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides

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