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Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures

by Liu, Qihang , Bronsch, Wibke , Ulstrup, Søren , Biswas, Deepnarayan , Majchrzak, Paulina , Cilento, Federico , Tuniz, Manuel , Liu, Yuntian , Chen, Yong P , Sahoo, Chakradhar , Puntel, Denny , Volckaert, Klara , Xing-Chen, Pan

in Charge transfer / Electronic structure / Excitation / Fluence / Heterostructures / Interlayers / Magnetic induction / Magnetic properties / Optical properties / Phonons / Photoelectric emission / Scattering / Thermal relaxation / Topological insulators / Topology / Tunable lasers

2024

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2024

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2024

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Paper

Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures

Liu, Qihang,

Bronsch, Wibke,

Ulstrup, Søren,

Biswas, Deepnarayan,

Majchrzak, Paulina,

Cilento, Federico,

Tuniz, Manuel,

Liu, Yuntian,

Chen, Yong P,

Sahoo, Chakradhar,

Puntel, Denny,

Volckaert, Klara,

Xing-Chen, Pan

2024

Overview

Heterostructures composed of the intrinsic magnetic topological insulator MnBi\\(_2\\)Te\\(_4\\) and its non-magnetic counterpart Bi\\(_2\\)Te\\(_3\\) host distinct surface electronic band structures depending on the stacking order and exposed termination. Here, we probe the ultrafast dynamical response of MnBi\\(_2\\)Te\\(_4\\) and MnBi\\(_4\\)Te\\(_7\\) following near-infrared optical excitation using time- and angle-resolved photoemission spectroscopy, and disentangle surface from bulk dynamics based on density functional theory slab calculations of the surface-projected electronic structure. We gain access to the out-of-equilibrium charge carrier populations of both MnBi\\(_2\\)Te\\(_4\\) and Bi\\(_2\\)Te\\(_3\\) surface terminations of MnBi\\(_4\\)Te\\(_7\\), revealing an instantaneous occupation of states associated with the Bi\\(_2\\)Te\\(_3\\) surface layer followed by carrier extraction into the adjacent MnBi\\(_2\\)Te\\(_4\\) layers with a laser fluence-tunable delay of up to 350 fs. The ensuing thermal relaxation processes are driven by phonon scattering with significantly slower relaxation times in the magnetic MnBi\\(_2\\)Te\\(_4\\) septuple layers. The observed competition between interlayer charge transfer and intralayer phonon scattering demonstrates a method to control ultrafast charge transfer processes in MnBi\\(_2\\)Te\\(_4\\)-based van der Waals compounds.

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Publisher

Cornell University Library, arXiv.org

Subject

Charge transfer

/ Electronic structure

/ Fluence