Gradient polaritonic surface with space-variant switchable light-matter interactions in 2D moiré superlattices DOI Creative Commons
Zhen-Bing Dai, Hua Fan, Vyacheslav Semenenko

et al.

Science Advances, Journal Year: 2024, Volume and Issue: 10(50)

Published: Dec. 13, 2024

Polaritons in two-dimensional (2D) materials provide unique opportunities for controlling light at nanoscales. Tailoring these polaritons via gradient polaritonic surfaces with space-variant response can enable versatile light-matter interaction platforms advanced functionalities. However, experimental progress has been hampered by the optical losses and poor confinement of conventionally used artificial nanostructures. Here, we demonstrate natural based on superlattices solitons—localized structural deformations—in a prototypical moiré system, twisted bilayer graphene boron nitride. We on-off switching continuous modulation local polariton-soliton interactions, which results from marked modifications topological conventional soliton states through variation strain direction. Furthermore, reveal capability structures to spatially modify near-field profile, phase, propagation direction record-small footprints, enabling generation electrical directional polaritons. Our findings open up new avenues toward nanoscale manipulation interactions spatial polariton engineering superlattices.

Language: Английский

Moiré band structure engineering using a twisted boron nitride substrate DOI Creative Commons
Xirui Wang,

Cheng Xu,

Samuel Aronson

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

Applying long wavelength periodic potentials on quantum materials has recently been demonstrated to be a promising pathway for engineering novel phases of matter. Here, we utilize twisted bilayer boron nitride (BN) as moiré substrate band structure engineering. Small-angle-twisted BN is endowed with periodically arranged up and down polar domains, which imprints electrostatic potential target two-dimensional (2D) material placed top. As proof concept, use Bernal graphene the material. The resulting modulation appears superlattice resistance peaks, tunable by varying twist angle, Hofstadter butterfly physics under magnetic field. Additionally, demonstrate tunability altering dielectric thickness underneath BN. Finally, find that near-60°-twisted also leads features in graphene, may come from in-plane piezoelectric effect or out-of-plane corrugation effect. Tunable serve versatile platforms engineer electronic, optical, mechanical properties 2D van der Waals heterostructures.

Language: Английский

Citations

4
Gate-tunable topological phases in superlattice modulated bilayer graphene DOI
Yongxin Zeng, Tobias Wolf, Chunli Huang

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 109(19)

Published: May 2, 2024

Superlattice potential modulation can produce flat minibands in Bernal-stacked bilayer graphene.In this work we study how band topology and interaction-induced symmetry-broken phases system are controlled by tuning the displacement field shape strength of superlattice potential.We use an analytic perturbative analysis to demonstrate that topological bands favored a honeycomb-lattice-shaped potential, numerics show robustness depends on both periodicity potential.At integer fillings bands, tune phase transitions between quantum anomalous Hall insulator, trivial metallic states.We present mean-field diagrams gate voltage parameter space at filling factor ν = 1, discuss prospects realizing insulators fractional Chern when is produced dielectric patterning or adjacent moiré materials.

Language: Английский

Citations

14
Parent Berry Curvature and the Ideal Anomalous Hall Crystal DOI Creative Commons
Tixuan Tan, Trithep Devakul

Physical Review X, Journal Year: 2024, Volume and Issue: 14(4)

Published: Nov. 12, 2024

We study a model of electrons moving in parent band uniform Berry curvature. At sufficiently high curvature, we show that strong repulsive interactions generically lead to the formation an anomalous Hall crystal: topological state with spontaneously broken continuous translation symmetry. Our results are established via mapping problem Wigner crystallization regular 2D electron gas. Interestingly, find periodic electrostatic potential induces competing opposite Chern number. theory offers unified perspective for understanding several aspects recently observed integer and fractional quantum effects rhombohedral multilayer graphene provides recipe engineering new states. Published by American Physical Society 2024

Language: Английский

Citations

10
Designing Topology and Fractionalization in Narrow Gap Semiconductor Films via Electrostatic Engineering DOI
Tixuan Tan, Aidan P. Reddy, Liang Fu

et al.

Physical Review Letters, Journal Year: 2024, Volume and Issue: 133(20)

Published: Nov. 12, 2024

We show that topological flat minibands can be engineered in a class of narrow gap semiconductor films using only an external electrostatic superlattice potential. demonstrate that, for realistic material parameters, these bands are capable hosting correlated phases such as integer and fractional quantum anomalous Hall states composite Fermi liquid at zero magnetic field. Our results provide path toward the realization fractionalized broad range materials.

Language: Английский

Citations

7
Optical Trapping of Few‐Layered Materials on Solid Substrates for In Situ and Dynamic Fabrication DOI
Zhangxing Shi, Tianci Shen,

Dou Lin

et al.

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(9)

Published: June 25, 2024

Abstract The performances of few‐layered (FL) material‐based devices are usually fixed after fabrication and difficult to be further dynamically tuned. As the thickness approaches atomic scale, moving FL materials on solid substrates is challenging due substantial increase in interfacial friction simultaneous decrease stiffness. Here, believed first, optical trapping dry demonstrated, with attractive advantages ultralow excitation power (µW level), high precision, wear‐free. mechanism relies photothermal shock‐induced thermal gradient force traps. Precise motion control including translation rotation achieved, step resolutions ≈0.15 nm ≈1.6 × 10 −3 degrees per laser pulse, respectively. Direct locomotion a minimal 2.5 indirect tri‐layers MoS 2 (≈1.9 thickness) by optically dragging multilayered sections demonstrated. Furthermore, situ construction homo‐ heterostructures dynamic modulation nanowire lasing spectra showcased. This study will facilitate nanoelectronic/photonic both structures

Language: Английский

Citations

5
Engineering band structures of two-dimensional materials with remote moiré ferroelectricity DOI Creative Commons

Jing Ding,

Hanxiao Xiang,

Wenqiang Zhou

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Oct. 21, 2024

The stacking order and twist angle provide abundant opportunities for engineering band structures of two-dimensional materials, including the formation moiré bands, flat topologically nontrivial bands. inversion symmetry breaking in rhombohedral-stacked transitional metal dichalcogenides endows them with an interfacial ferroelectricity associated out-of-plane electric polarization. By utilizing as a knob to construct dichalcogenides, antiferroelectric domain networks alternating polarization can be generated. Here, we demonstrate that such spatially periodic ferroelectric polarizations parallel-stacked twisted WSe2 imprint their potential onto remote bilayer graphene. This gives rise pronounced satellite resistance peaks besides charge-neutrality point graphene, which are tunable by WSe2. Our observations hysteresis at finite displacement fields suggest is delivered long-range electrostatic potential. constructed superlattices represent highly flexible approach, they involve separation construction layer from electronic transport layer. identified weak coexist conventional moiré. results offer comprehensive strategy properties materials ferroelectricity. authors providing structures.

Language: Английский

Citations

4
Designing band structures by patterned dielectric superlattices DOI
Zhen Zhan, Yonggang Li, Pierre A. Pantaleón

et al.

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(4)

Published: Jan. 22, 2025

Language: Английский

Citations

0
Synthetic Band Structure Engineering of Graphene Using Block Copolymer-Templated Dielectric Superlattices DOI Creative Commons
Moeid Jamalzadeh, Zihan Zhang, Zhujun Huang

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Engineering the electronic band structure of two-dimensional (2D) materials by imposing spatially periodic superlattice (SL) potentials opens a pathway to unconventional electronics. Nanopatterning gate electrode or surface dielectric near 2D crystals provides powerful strategy for realizing electrostatically tunable "remote" SLs with flexibility in lattice design. Here, we demonstrate effectiveness block copolymer (BCP)-templated nanopatterns fabricating etch-free high-grade metal oxide SLs. Alumina (AlOx) hexagonal symmetry and 38 nm SL wavelength are produced as model material directly converting self-assembled BCP film via block-selective vapor phase infiltration. Despite micrometer-scale rotational disorder inherent self-assembly, transport measurements graphene reveal replica Dirac points at zero field Hofstadter mini-gaps under finite magnetic fields. These results indicate successful formation remote resulting from optimized AlOx nanopattern fabrication achieve consistent periodicity macroscopic scale. The findings this study, combined versatile, scalable, cost-effective nature nanopatterning, highlight potential BCP-templated nanostructures engineering crystals.

Language: Английский

Citations

0
Enhanced Backgate Tunability on Interfacial Carrier Concentration in Ionic Liquid‐Gated MoS2 Devices DOI
Qiao Chen, Chengyu Yan,

Changshuai Lan

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Abstract The periodic spatial modulation potential arising from the zig‐zag distribution of ions at large gate voltage in an ionic liquid‐gated device may enable functionalities a similar way as nanopatterning and moiré engineering. However, inherent coupling between carrier concentration liquid devices has hindered further exploration. Here, feasibility decoupling manipulation on density is demonstrated by using conventional backgate. backgate found to have tunability comparable that gating, especially voltage, activating bulk channels mediated back tunneling trapped bands interfacial channel.

Language: Английский

Citations

0
Moiré collective vibrations in atomically thin van der Waals superlattices DOI Creative Commons

Lijia Li,

Jiajun Chen, Laigui Hu

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: May 2, 2025

Collective vibration is pivotal for materials' thermal, electrical, phase transition and topological properties. Lately, the rising of moiré superlattices, characterized by overarching periodicity pattern, generates highly tunable interfacial structures that manipulate collective excitations in material at atomic scale. Here, we experimentally demonstrate vibrations, mechanical counterparts excitons, heterointerfaces twisted tungsten diselenide/tungsten disulfide heterobilayers. Using helicity-resolved inelastic Raman scattering, find chiral phonons carrying angular momentum analogous to bulk quartz, enabling unprecedented spectral resolution rich vibrational modes heterointerface a few layers. Upon mutual torsion heterobilayers, observe terahertz interlayer vibrations proportional as periodic function rotation angles, demonstrating moiré-tuned which couple Coulomb-bound electron-hole pairs excitons. In low-angle strong coupling regime, dynamics exhibit distinct long-lived breathing mode with zero pronounced high energy, highlighting phonon-hybridization character wherein intralayer are folded into mini-Brillouin zone spatial hybridize vibrations. Our findings establish candidates exploitation energy-efficient thermal management, strongly correlated electrical engineering, new emergent phononics.

Language: Английский

Citations

0