Nanoscale mapping of native defects in Td-MoTe2 and their impact on graphene-based van der Waals heterostructures

Wojciech Ryś; Iaroslav Lutsyk; Mindaugas Lukosius; Przemysław Przybysz; Paweł Dąbrowski; Maciej Rogala; Paweł Krukowski; Paweł J. Kowalczyk

arXiv · 2610.34924

Nanoscale mapping of native defects in Td-MoTe2 and their impact on graphene-based van der Waals heterostructures

Wojciech Ryś·Iaroslav Lutsyk·Mindaugas Lukosius·Przemysław Przybysz·Paweł Dąbrowski·Maciej Rogala·Paweł Krukowski·Paweł J. Kowalczyk

View original source ↗Read source document ↗Export metadata ↓

Abstract

We investigate native defects and their impact on the electronic structure of Td-MoTe2 and graphene/Td-MoTe2 van der Waals heterostructures using scanning tunnelling microscopy and spectroscopy. STM reveals a high density of circular, hollow surface defects that we attribute to Te vacancies. STS on pristine MoTe2 shows semimetallic, V-shaped dI/dV spectra with subtle low-energy states. The vacancies suppress the tunnelling conductance below the Fermi level without introducing new sharp defect-related resonances, consistent with a vacancy-induced redistribution of Mo-Te spectral weight rather than the appearance of new electronic states. In the heterostructure, graphene preserves these MoTe2 fingerprints with no noticeable graphene doping or charge transfer. Our results demonstrate that isolated native Te vacancies act as spectroscopically weak perturbations to the low-energy electronic structure of graphene. The graphene overlayer further screens their impact on the electronic structure, making graphene/Td-MoTe2 heterostructures intrinsically tolerant to such interface defects.

Explore related subjects

cond-mat.mes-hall

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

Wojciech Ryś, Iaroslav Lutsyk, Mindaugas Lukosius, Przemysław Przybysz, Paweł Dąbrowski, Maciej Rogala, Paweł Krukowski, Paweł J. Kowalczyk. 2026-10-26. Nanoscale mapping of native defects in Td-MoTe2 and their impact on graphene-based van der Waals heterostructures. https://arxiv.org/abs/2610.34924

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Subspace-Protected Topological Phases and Bulk-Boundary Correspondence

While tremendous research has revealed that symmetry enriches topological phases of matter, more general principles that protect topological phases have yet to be explored. In this Letter, we elucidate the roles of subspaces in free-fermionic topological phases. A subspace property for Hamiltonians enables us to define new topological invariants. It results in peculiar topological boundary phenomena, i.e., the emergence of an unpaired zero mode or zero-winding skin modes, characterizing subspace-protected topological phases. We establish and demonstrate the bulk-boundary correspondence in subspace-protected topological phases. We further discuss the interplay of the subspace property and internal symmetries. Toward application, we also propose possible platforms possessing the subspace property.

cond-mat.mes-hall↗

arXiv2026

Coexistence of Ferromagnetic and Overscreened Kondo Effects in a Single Molecule

The quest for quantum ground states beyond the Fermi-liquid paradigm remains a central challenge in many-body physics. The ferromagnetic Kondo effect is an intriguing variant of the Kondo effect in which an asymptotically free spin gives rise to singular Fermi-liquid behavior. Despite its theoretical importance, this regime has eluded experimental observation owing to subtle spectroscopic signatures, small energy scales, and symmetry constraints in nanostructures. Here, we demonstrate the coexistence of ferromagnetic and overscreened Kondo effects within a molecular spin system---a triangulene dimer comprising spin-1 and spin-1/2 units adsorbed on a metal surface. Low-temperature scanning tunneling spectroscopy reveals signatures of singular Fermi-liquid behavior, supported by many-body calculations. The molecular design provides control over spin configuration and coupling asymmetry, allowing distinct regimes within the same platform. Our results establish a strategy for realizing non-Fermi-liquid physics at the atomic scale and demonstrate that ferromagnetic Kondo behavior can be deliberately engineered in molecular systems.

cond-mat.mes-hall↗

arXiv2026

Parity-selected charging and noise-correlated work retention in a coupled Si/SiGe double quantum dot battery: theory and experimentally parameterized modeling

We investigate extractable work storage in a capacitively coupled double quantum dot (DQD) quantum battery (QB) subjected to experimentally motivated detuning charge noise. The battery is modeled as two interacting charge qubits with an Ising-type capacitive coupling and is charged by resonant microwave modulation of the tunnel coupling channel. Detuning fluctuations are introduced as classical stochastic processes generated from a band-limited 1/f noise spectrum. For each noise realization, the evolution remains unitary, whereas decoherence and loss of contrast emerge after ensemble averaging. We analyze the total ergotropy, its population and coherent contributions, the energy basis populations, a passive ordering violation diagnostic, and the Jensen-Shannon coherence of the noise-averaged state. The results show that resonant tunnel coupling driving selects a dominant E0 <-> E3 population transfer channel in the interacting DQD spectrum. The dominant extractable work is stored in non-passive population distributions, in agreement with recent population ordering interpretations of ergotropy in QBs, while coherence accompanies and supports the resonant transfer as a transient dynamical resource. Detuning noise reduces the energy basis coherence amplitude and also weakens the population transfer pathway responsible for the dominant population ergotropy. This framework provides a noise-aware description of semiconductor QB charging based on extractable work rather than on injected energy alone.

cond-mat.mes-hall↗