Van der Waals Engineering of Ultrafast Carrier Dynamics in Magnetic Heterostructures

Majchrzak, Paulina Ewa1; Liu, Yuntian2,3; Volckaert, Klara1; Biswas, Deepnarayan1; Sahoo, Chakradhar1; Puntel, Denny4; Bronsch, Wibke5; Tuniz, Manuel4; Cilento, Federico5; Pan, Xing-Chen6; Liu, Qihang2,3; Chen, Yong P.1,6,7,8; Ulstrup, Soren1

2023

10.1021/acs.nanolett.2c03075

NANO LETTERS   Impact Factor & Quartile

1530-6984

1530-6992

Heterostructures composed of the intrinsic magnetic topological insulator MnBi2Te4 and its nonmagnetic counterpart Bi2Te3 host distinct surface electronic band structures depending on the stacking order and exposed termination. Here, we probe the ultrafast dynamical response of MnBi2Te4 and MnBi4Te7 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 MnBi2Te4 and Bi2Te3 surface terminations of MnBi4Te7, revealing an instantaneous occupation of states associated with the Bi2Te3 surface layer followed by carrier extraction into the adjacent MnBi2Te4 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 MnBi2Te4 septuple layers. The observed competition between interlayer charge transfer and intralayer phonon scattering demonstrates a method to control ultrafast charge transfer processes in MnBi2Te4-based van der Waals compounds.

magnetic topological insulators MnBi2Te4 van der Waals heterostructures ultrafast carrier dynamics time-and angle-resolved photoemission spectroscopy density functional theory

SCI

English

NI Journal Papers

Others

VILLUM FONDEN through the Young Investigator Program[15375] ; Villum Investigator Program[25931] ; Centre of Excellence for Dirac Materials[11744] ; Danish Council for Independent Research, Natural Sciences, under the Sapere Aude program[DFF-9064-00057B] ; JSPS KAKENHI Basic Science A[18H03858] ; New Science["18H04473","20H04623"] ; Marie Sklodowska-Curie Postdoctoral Fellowship[101059528] ; National Key R&D Program of China[2020YFA0308900]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000912675400001

AMER CHEMICAL SOC

MATERIALS SCIENCE

Web of Science

1.Aarhus Univ, Interdisciplinary Nanosci Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn SIQSE, Shenzhen 518055, Peoples R China
4.Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy
5.Elettra Sincrotrone Trieste SCpA, I-34149 Basovizza, Italy
6.Tohoku Univ, Adv Inst Mat Res, Sendai 9808577, Japan
7.Purdue Univ, Dept Phys & Astron, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA
8.Purdue Univ, Purdue Quantum Sci & Engn Inst, W Lafayette, IN 47907 USA

Majchrzak, Paulina Ewa,Liu, Yuntian,Volckaert, Klara,et al. Van der Waals Engineering of Ultrafast Carrier Dynamics in Magnetic Heterostructures[J]. NANO LETTERS,2023.

Majchrzak, Paulina Ewa.,Liu, Yuntian.,Volckaert, Klara.,Biswas, Deepnarayan.,Sahoo, Chakradhar.,...&Ulstrup, Soren.(2023).Van der Waals Engineering of Ultrafast Carrier Dynamics in Magnetic Heterostructures.NANO LETTERS.

Majchrzak, Paulina Ewa,et al."Van der Waals Engineering of Ultrafast Carrier Dynamics in Magnetic Heterostructures".NANO LETTERS (2023).