Characterization of fractional Chern insulator quasiparticles in twisted homobilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>MoTe</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math>

We provide a detailed study of Abelian quasiparticles of valley polarized fractional Chern insulators (FCIs) residing in the top valence band of twisted bilayer ${\mathrm{MoTe}}_{2}$ (${\mathrm{tMoTe}}_{2}$) at hole filling ${\ensuremath{\nu}}_{h}=2/3$. We construct a tight-binding model of delocalized quasiparticles to capture the energy dispersion of a single quasiparticle. We then localize quasiparticles by short-range delta impurity potentials. Unlike the fractional quantum Hall (FQH) counterpart in the lowest Landau level (LLL), the density profile around the localized FCI quasiparticle in ${\mathrm{tMoTe}}_{2}$ depends on the location of the impurity potential and loses the continuous rotation invariance. The FCI quasiparticle localized at moir\'e lattice center closely follows the anyon Wannier state of the tight-binding model of the mobile quasiparticle. Despite of the difference in density profiles, we find that the excess charge around the impurity potential for the ${\ensuremath{\nu}}_{h}=2/3$ FCIs in ${\mathrm{tMoTe}}_{2}$ is still similar to that of the $\ensuremath{\nu}=2/3$ FQH state in the LLL if an effective magnetic length on the moir\'e lattice is chosen as the length unit, which allows a rough estimation of the spatial extent of the FCI quasiparticle. Far away from the impurity potential, this excess charge has the tendency to reach $e/3$, as expected for the Laughlin quasiparticle. The braiding phase of two FCI quasiparticles in ${\mathrm{tMoTe}}_{2}$ also agrees with the theoretical prediction of fractional statistics. We characterize the interaction between two FCI quasiparticles and find a crossover from repulsive to attractive interaction as gate-to-sample distances decreases. Based on the nearly ideal quantum geometry of the top valence band of ${\mathrm{tMoTe}}_{2}$, we propose a trial wave function for localized FCI quasiparticles, which reproduces the key feature of the density profile around a quasiparticle.

Authors

Institutions

Publication Details

Journal
Physical review. B./Physical review. B
Published
2025-12-01
DOI
https://doi.org/10.1103/nddl-729x
Citations
2
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
2.49
Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Characterization of fractional Chern insulator quasiparticles in twisted homobilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>MoTe</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math>

Bohao Li, Fengcheng Wu, Zhao Liu, Y.W. Shi
2 citations
Physical review. B./Physical review. B
Topological Materials and Phenomena
2.49
article

Characterization of fractional Chern insulator quasiparticles in twisted homobilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>MoTe</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math>

Bohao Li, Fengcheng Wu, Zhao Liu, Y.W. Shi
article en
2 citations

Abstract

We provide a detailed study of Abelian quasiparticles of valley polarized fractional Chern insulators (FCIs) residing in the top valence band of twisted bilayer ${\mathrm{MoTe}}_{2}$ (${\mathrm{tMoTe}}_{2}$) at hole filling ${\ensuremath{\nu}}_{h}=2/3$. We construct a tight-binding model of delocalized quasiparticles to capture the energy dispersion of a single quasiparticle. We then localize quasiparticles by short-range delta impurity potentials. Unlike the fractional quantum Hall (FQH) counterpart in the lowest Landau level (LLL), the density profile around the localized FCI quasiparticle in ${\mathrm{tMoTe}}_{2}$ depends on the location of the impurity potential and loses the continuous rotation invariance. The FCI quasiparticle localized at moir\'e lattice center closely follows the anyon Wannier state of the tight-binding model of the mobile quasiparticle. Despite of the difference in density profiles, we find that the excess charge around the impurity potential for the ${\ensuremath{\nu}}_{h}=2/3$ FCIs in ${\mathrm{tMoTe}}_{2}$ is still similar to that of the $\ensuremath{\nu}=2/3$ FQH state in the LLL if an effective magnetic length on the moir\'e lattice is chosen as the length unit, which allows a rough estimation of the spatial extent of the FCI quasiparticle. Far away from the impurity potential, this excess charge has the tendency to reach $e/3$, as expected for the Laughlin quasiparticle. The braiding phase of two FCI quasiparticles in ${\mathrm{tMoTe}}_{2}$ also agrees with the theoretical prediction of fractional statistics. We characterize the interaction between two FCI quasiparticles and find a crossover from repulsive to attractive interaction as gate-to-sample distances decreases. Based on the nearly ideal quantum geometry of the top valence band of ${\mathrm{tMoTe}}_{2}$, we propose a trial wave function for localized FCI quasiparticles, which reproduces the key feature of the density profile around a quasiparticle.

Physical review. B./Physical review. BVol. 112(24)
Wuhan University (CN), Institute of Modern Physics (CN), Zhejiang University (CN), Wuhan Institute of Technology (CN)
Openalex Percentile: Top 9%
Topological Materials and Phenomena
2.49
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.