Publications (35)
Optical properties of single ZnTe nanowires grown at low temperature
Alberto Artioli, Pamela Rueda-Fonseca, Petr Stepanov +11
Optically active gold-catalyzed ZnTe nanowires have been grown by molecular beam epitaxy, on a ZnTe(111) buffer layer, at low temperature 350\degree under Te rich conditions, and a…
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…
Certified randomness in tight space
Andreas Fyrillas, Boris Bourdoncle, Alexandre Maïnos +13
Reliable randomness is a core ingredient in algorithms and applications ranging from numerical simulations to statistical sampling and cryptography. The outcomes of measurements on…
Probing Azimuthal Anatomy of Hyperbolic Whispering Gallery Modes in hBN
Bogdan Borodin, Samyobrata Mukherjee, Shivaksh Rawat +8
Scattering-type scanning near-field optical microscopy (s-SNOM) is a powerful tool for investigating polaritonic modes. However, an inherent limitation of this technique is that ex…
Efficient fiber-pigtailed source of indistinguishable single photons
Nico Margaria, Florian Pastier, Thinhinane Bennour +19
Semiconductor quantum dots in microcavities are an excellent platform for the efficient generation of indistinguishable single photons. However, their use in a wide range of quantu…
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 s…
Revealing the structure of light pseudoscalar mesons at the Electron-Ion Collider
John Arrington, Carlos Ayerbe Gayoso, Patrick C Barry +29
How the bulk of the Universe's visible mass emerges and how it is manifest in the existence and properties of hadrons are profound questions that probe into the heart of strongly i…
Collective excitations in twisted bilayer graphene close to the magic angle
Niels C. H. Hesp, Iacopo Torre, Daniel Rodan-Legrain +14
The electronic properties of twisted bilayer graphene (TBG) can be dramatically different from those of a single graphene layer, in particular when the two layers are rotated relat…
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…
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…
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…
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…
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 (…
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…
Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene
Roshan Krishna Kumar, Geng Li, Riccardo Bertini +24
Moiré materials represent strongly interacting electron systems bridging topological and correlated physics. Despite significant advances, decoding wavefunction properties underly…
In situ engineering hexagonal boron nitride in van der Waals heterostructures with selective SF6 etching
Hitesh Agarwal, Antoine Reserbat-Plantey, David Barcons Ruiz +10
Van der Waals heterostructures are at the forefront in materials heterostructure engineering, offering the ultimate control in layer selectivity and capability to combine virtually…
Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
Xiaobo Lu, Petr Stepanov, Wei Yang +10
Superconductivity often occurs close to broken-symmetry parent states and is especially common in doped magnetic insulators. When twisted close to a magic relative orientation angl…
Launching Focused and Spatially Confined Phonon-Polaritons in Hexagonal Boron Nitride
Bogdan Borodin, Sergey Lepeshov, Kenji Watanabe +2
Phonon-polaritons offer significant opportunities for low-loss, subdiffractional light guiding at the nanoscale. Despite extensive efforts to enhance control in polaritonic media,…
Untying the insulating and superconducting orders in magic-angle graphene
Petr Stepanov, Ipsita Das, Xiaobo Lu +7
The coexistence of superconducting and correlated insulating states in magic-angle twisted bilayer graphene prompts fascinating questions about the relationship of these orders. In…
Cryo-Near-Field Photovoltage Microscopy of Heavy-Fermion Twisted Symmetric Trilayer Graphene
Sergi Batlle-Porro, Dumitru Calugaru, Haoyu Hu +7
Ever since the initial experimental observation of correlated insulators and superconductivity in the flat Dirac bands of magic angle twisted bilayer graphene, a search for the mic…
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…
Near-identical photons from distant quantum dot-cavity devices
Thibaut Pollet, Victor Guilloux, Duc-Duy Tran +13
Scalable optical quantum technologies require interference between large numbers of indistinguishable single-photons emitted by independent sources. Semiconductor quantum dots are…
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…
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…
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…
Dispersion relation of the collective excitations in a resonantly driven polariton fluid
Petr Stepanov, Ivan Amelio, Jean-Guy Rousset +6
Exciton-polaritons in semiconductor microcavities constitute the archetypal realization of a quantum fluid of light. Under coherent optical drive, remarkable effects such as superf…
Thermal decoherence of a nonequilibrium polariton fluid
Sebastian Klembt, Petr Stepanov, Thorsten Klein +2
Exciton-polaritons constitute a unique realization of a quantum fluid interacting with its environment. Using Selenide based microcavities, we exploit this feature to warm up a pol…
Direct evidence for flat bands in twisted bilayer graphene from nano-ARPES
Simone Lisi, Xiaobo Lu, Tjerk Benschop +21
Transport experiments in twisted bilayer graphene revealed multiple superconducting domes separated by correlated insulating states. These properties are generally associated with…
A general-purpose single-photon-based quantum computing platform
Nicolas Maring, Andreas Fyrillas, Mathias Pont +24
Quantum computing aims at exploiting quantum phenomena to efficiently perform computations that are unfeasible even for the most powerful classical supercomputers. Among the promis…
Industry-ready spin-photon interfaces for hybrid photonic quantum computing
Hêlio Huet, Hubert Lam, Thibaut Pollet +45
The paper demonstrates large‑scale, foundry‑compatible semiconductor quantum‑dot devices that act as efficient spin‑photon interfaces, achieving near‑unity photon purity, multi‑pho…
Infrared Spectroscopy for Diagnosing Superlattice Minibands in Magic-angle Twisted Bilayer Graphene
Geng Li, Roshan Krishna Kumar, Petr Stepanov +11
Twisted bilayer graphene (TBG) represents a highly tunable, strongly correlated electron system owed to its unique flat electronic bands. However, understanding the single-particle…
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…
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…
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…