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Bloch Wavefunction Reconstruction using Multidimensional Photoemission Spectroscopy

MPS-Authors
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Pincelli,  Tommaso
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Dong,  Shuo
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Rettig,  Laurenz
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ernstorfer,  Ralph
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Beaulieu,  Samuel
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Université de Bordeaux - CNRS - CEA, CELIA;

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2103.17168.pdf
(Preprint), 4MB

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Citation

Schüler, M., Pincelli, T., Dong, S., Devereaux, T. P., Wolf, M., Rettig, L., et al. (in preparation). Bloch Wavefunction Reconstruction using Multidimensional Photoemission Spectroscopy.


Cite as: http://hdl.handle.net/21.11116/0000-0008-561E-7
Abstract
Angle-resolved spectroscopy is the most powerful technique to investigate the electronic band structure of crystalline solids. To completely characterize the electronic structure of topological materials, one needs to go beyond band structure mapping and probe the texture of the Bloch wavefunction in momentum-space, associated with Berry curvature and topological invariants. Because phase information is lost in the process of measuring photoemission intensities, retrieving the complex-valued Bloch wavefunction from photoemission data has yet remained elusive. In this Article, we introduce a novel measurement methodology and observable in extreme ultraviolet angle-resolved photoemission spectroscopy, based on continuous modulation of the ionizing radiation polarization axis. By tracking the energy- and momentum-resolved amplitude and phase of the photoemission modulation upon polarization variation, we reconstruct the Bloch wavefunction of prototypical semiconducting transition metal dichalcogenide 2H-WSe2 with minimal theory input. This novel experimental scheme, which is articulated around the manipulation of the photoionization transition dipole matrix element, in combination with a simple tight-binding theory, is general and can be extended to provide insights into the Bloch wavefunction of many relevant crystalline solids.