Valleytronics in bulk MoS2 with a topologic optical field

The valley degree of freedom14 of electrons in materials promises routes towards energy-efficient information storage with enticing prospects for quantum information processing5 7. Current challenges in utilizing valley polarization are symmetry conditions that require monolayer structures8,9 or spe...

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Published in:Nature (London) 2024-04, Vol.628 (8009), p.746-751F
Main Authors: Tyulnev, Igor, Jiménez-Galán, Alvaro, Poborska, Julita, Vamos, Lenard, Russell, Philip ST J, Tani, Francesco, Smirnova, Olga, Ivanov, Misha, Silva, Rui E F, Biegert, Jens
Format: Article
Language:English
Subjects:
Angular momentum
Energy dissipation
Energy efficiency
Energy storage
Information processing
Information storage
Lasers
Molybdenum disulfide
Monolayers
Optical control
Polarization
Quantum phenomena
Rotation
Spectrum analysis
Symmetry
Topology
Valleys
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container_issue 8009
container_start_page 746
container_title Nature (London)
container_volume 628
creator Tyulnev, Igor
Jiménez-Galán, Alvaro
Poborska, Julita
Vamos, Lenard
Russell, Philip ST J
Tani, Francesco
Smirnova, Olga
Ivanov, Misha
Silva, Rui E F
Biegert, Jens
description The valley degree of freedom14 of electrons in materials promises routes towards energy-efficient information storage with enticing prospects for quantum information processing5 7. Current challenges in utilizing valley polarization are symmetry conditions that require monolayer structures8,9 or specific material engineering10 13, non-resonant optical control to avoid energy dissipation and the ability to switch valley polarization at optical speed. We demonstrate all-optical and non-resonant control over valley polarization using bulk MoS2, a centrosymmetric material without Berry curvature at the valleys. Our universal method utilizes spin angular momentum-shaped trefoil optical control pulses14,15 to switch the material's electronic topology and induce valley polarization by transiently breaking time and space inversion symmetry16 through a simple phase rotation. We confirm valley polarization through the transient generation of the second harmonic of a non-collinear optical probe pulse, depending on the trefoil phase rotation. The investigation shows that direct optical control over the valley degree of freedom is not limited to monolayer structures. Indeed, such control is possible for systems with an arbitrary number of layers and for bulk materials. Non-resonant valley control is universal and, at optical speeds, unlocks the possibility of engineering efficient multimaterial valleytronic devices operating on quantum coherent timescales.
doi_str_mv 10.1038/s41586-O24-O7156-y
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subjects Angular momentum
Energy dissipation
Energy efficiency
Energy storage
Information processing
Information storage
Lasers
Molybdenum disulfide
Monolayers
Optical control
Polarization
Quantum phenomena
Rotation
Spectrum analysis
Symmetry
Topology
Valleys
title Valleytronics in bulk MoS2 with a topologic optical field
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