Designing exotic phases of matter with magnetic van der Waals materials

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School of Science | Doctoral thesis (article-based) | Defence date: 2023-06-26
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Authors

Date

2023

Department

Teknillisen fysiikan laitos
Department of Applied Physics

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Mcode

Degree programme

Language

en

Pages

138 + app. 184

Series

Aalto University publication series DOCTORAL THESES, 84/2023

Abstract

Magnetic van der Waals materials have recently emerged as a realization of quantum magnetism in two dimensions. They host a variety of phases including ferromagnets, anti-ferromagnets, helimagnets, and quantum spin liquids. The 2D nature of these materials makes them versatile platforms for quantum engineering. In this thesis, we explore via theoretical techniques how different quantum engineering methods allow to design and reveal exotic phases of matter in magnetic van der Waals materials. In particular, we will present three schemes. The first scheme focuses on external engineering on a 2D magnet to promote and identify the quantum spin liquid phase. The second scheme focuses on designing helical electronic states and heavy fermions via proximity to 2D magnets. The third scheme focuses on the utilization of the coupling of quantum magnets to the environment to design non-Hermitian many-body topological phases of matter. Our results put forward magnetic van der Waals materials as a versatile platform for engineering exotic phases of matter.

Description

Supervising professor

Lado, Jose L., Prof., Aalto University, Department of Applied Physics, Finland

Keywords

magnetic van der Waals materials, quantum spin liquids, helical states, heavy-fermions, non-Hermitian physics

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Parts

  • [Publication 1]: Guangze Chen, Jose L. Lado. Impurity-induced resonant spinon zero modes in Dirac quantum spin liquids. Physical Review Research, 2, 033466, September 2020.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202009255526
    DOI: 10.1103/PhysRevResearch.2.033466 View at publisher
  • [Publication 2]: Guangze Chen, Jose L. Lado. Tunable moire spinons in magnetically encapsulated twisted van der Waals quantum spin liquids. Physical Review Research, 3, 033276, September 2021.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202109299340
    DOI: 10.1103/PhysRevResearch.3.033276 View at publisher
  • [Publication 3]: Guangze Chen, Malte Rösner, Jose L. Lado. Controlling magnetic frustration in 1T-TaS2 via Coulomb engineered long-range interactions. Journal of Physics: Condensed Matter, 34, 485805, October 2022.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202210266230
    DOI: 10.1088/1361-648X/ac9812 View at publisher
  • [Publication 4]: Guangze Chen, Maryam Khosravian, Jose L. Lado, Aline Ramires. Designing spin-textured flat bands in twisted graphene multilayers via helimagnet encapsulation. 2D Materials, 9, 024002, February 2022.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202205243410
    DOI: 10.1088/2053-1583/ac4af8 View at publisher
  • [Publication 5]: Viliam Vaňo, Mohammad Amini, Somesh C. Ganguli, Guangze Chen, Jose L. Lado, Shawulienu Kezilebieke and Peter Liljeroth. Artificial heavy fermions in a van der Waals heterostructure. Nature, 599, 582–586, November 2021.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-2021120110512
    DOI: 10.1038/s41586-021-04021-0 View at publisher
  • [Publication 6]: Guangze Chen, Fei Song, Jose L. Lado. Topological spin excitations in non-Hermitian spin chains with a generalized kernel polynomial algorithm. Physical Review Letters, 130, 100401, March 2023.
    Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-202303152399
    DOI: 10.1103/PhysRevLett.130.100401 View at publisher

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https://urn.fi/URN:ISBN:978-952-64-1299-3

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[diss] Perustieteiden korkeakoulu / SCI