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Cryogenic nano-imaging of second-order moiré superlattices
Niels C. H. Hesp, Sergi Batlle-Porro, Roshan Krishna Kumar +7
Second-order superlattices form when moiré superlattices of similar periodicities interfere with each other, leading to even larger superlattice periodicities. These crystalline st…
Tuning Spin Transport in a Graphene Antiferromagnetic Insulator
Petr Stepanov, Dmitry L. Shcherbakov, Shi Che +7
Long-distance spin transport through anti-ferromagnetic insulators (AFMIs) is a long-standing goal of spintronics research. Unlike conventional spintronics systems, monolayer graph…
Imaging Chern mosaic and Berry-curvature magnetism in magic-angle graphene
Sameer Grover, Matan Bocarsly, Aviram Uri +14
Charge carriers in magic angle graphene come in eight flavors described by a combination of their spin, valley, and sublattice polarizations. When the inversion and time reversal s…
Competing zero-field Chern insulators in Superconducting Twisted Bilayer Graphene
Petr Stepanov, Ming Xie, Takashi Taniguchi +5
The discovery of magic angle twisted bilayer graphene (MATBG) has unveiled a rich variety of superconducting, magnetic and topologically nontrivial phases. The existence of all the…
Layer- and Gate-tunable Spin-Orbit Coupling in a High Mobility Few-Layer Semiconductor
D. Shcherbakov, P. Stepanov, S. Memaran +14
Spin-orbit coupling (SOC) is a relativistic effect, where an electron moving in an electric field experiences an effective magnetic field in its rest frame. In crystals without inv…
Measuring local moiré lattice heterogeneity of twisted bilayer graphene
Tjerk Benschop, Tobias A. de Jong, Petr Stepanov +5
We introduce a new method to continuously map inhomogeneities of a moiré lattice and apply it to large-area topographic images we measure on open-device twisted bilayer graphene (T…
Exciton-exciton interaction beyond the hydrogenic picture in a MoSe monolayer in the strong light-matter coupling regime
Petr Stepanov, Amit Vashisht, Martin Klaas +9
In transition metal dichalcogenides layers of atomic scale thickness, the electron-hole Coulomb interaction potential is strongly influenced by the sharp discontinuity of the diele…
Interlayer Charge Transfer and Defect Creation in Type I van der Waals Heterostructures
G. Nayak, S. Lisi, W-L. Liu +13
Van der Waals heterostructures give access to a wide variety of new phenomena that emerge thanks to the combination of properties brought in by the constituent layered materials. W…
Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor
Nils Lundt, Lukasz Dusanowski, Evgeny Sedov +11
Spin-orbit coupling is a fundamental mechanism that connects the spin of a charge carrier with its momentum. Likewise, in the optical domain, a synthetic spin-orbit coupling is acc…
Quantum Parity Hall effect in ABA Graphene
Petr Stepanov, Yafis Barlas, Shi Che +10
The celebrated phenomenon of quantum Hall effect has recently been generalized from transport of conserved charges to that of other approximately conserved state variables, includi…
Raman Spectroscopy, Photocatalytic Degradation and Stabilization of Atomically Thin Chromium Triiodide
Dmitry Shcherbakov, Petr Stepanov, Daniel Weber +10
As a 2D ferromagnetic semiconductor with magnetic ordering, atomically thin chromium triiodide is the latest addition to the family of two-dimensional (2D) materials. However, real…
Integer and Fractional Quantum Hall effect in Ultra-high Quality Few-layer Black Phosphorus Transistors
Jiawei Yang, Son Tran, Jason Wu +8
As a high mobility two-dimensional semiconductor with strong structural and electronic anisotropy, atomically thin black phosphorus (BP) provides a new playground for investigating…
Twist Angle-Dependent Bands and Valley Inversion in 2D Materials/hBN Heterostructures
Shi Che, Petr Stepanov, Supeng Ge +13
The use of relative twist angle between adjacent atomic layers in a van der Waals heterostructure, has emerged as a new degree of freedom to tune electronic and optoelectronic prop…
Long-Distance Spin Transport Through a Graphene Quantum Hall Antiferromagnet
Petr Stepanov, Shi Che, Dmitry Shcherbakov +11
Antiferromagnetic insulators (AFMI) are robust against stray fields, and their intrinsic dynamics could enable ultrafast magneto-optics and ultrascaled magnetic information process…
Tunable symmetries of integer and fractional quantum Hall phases in heterostructures with multiple Dirac bands
Petr Stepanov, Yafis Barlas, Tim Espiritu +5
The co-presence of multiple Dirac bands in few-layer graphene leads to a rich phase diagram in the quantum Hall regime. Using transport measurements, we map the phase diagram of BN…
Large and uniform optical emission shifts in quantum dots externally strained along their growth axis
Petr Stepanov, Marta Elzo Aizarna, Joël Bleuse +6
We introduce a method which enables to directly compare the impact of elastic strain on the optical properties of distinct quantum dots (QDs). Specifically, the QDs are integrated…
Energy gaps and layer polarization of integer and fractional quantum Hall states in bilayer graphene
Yanmeng Shi, Yongjin Lee, Shi Che +6
Owing to the spin, valley, and orbital symmetries, the lowest Landau level (LL) in bilayer graphene exhibits multicomponent quantum Hall ferromagnetism. Using transport spectroscop…
A quantum fiber-pigtail
Davide Cadeddu, Jean Teissier, Floris Braakman +7
We present the experimental realization of a quantum fiber-pigtail. The device consists of a semiconductor quantum-dot embedded into a conical photonic wire that is directly connec…