128 citations · 1.5k across the 33 of their papers we have counts for
31 papers · 1 filter
Current-induced brightening of vacancy-related emitters in hexagonal boron nitride
Corinne Steiner, Rebecca Rahmel, Frank Volmer +9
We perform photoluminescence measurements on vacancy-related emitters in hexagonal boron nitride (hBN) that are notorious for their low quantum yields. The gating of these emitters…
Pauli blockade catalogue and three- and four-particle Kondo effect in bilayer graphene quantum dots
Chuyao Tong, Annika Kurzmann, Rebekka Garreis +4
Pauli blockade is a fundamental quantum phenomenon that also serves as a powerful tool for qubit manipulation and read-out. While most systems exhibit a simple even-odd pattern of…
Three-carrier spin blockade and coupling in bilayer graphene double quantum dots
Chuyao Tong, Florian Ginzel, Wei Wister Huang +8
The spin degree of freedom is crucial for the understanding of any condensed matter system. Knowledge of spin-mixing mechanisms is not only essential for successful control and man…
Counting Statistics of Single Electron Transport in Bilayer Graphene Quantum Dots
Rebekka Garreis, Jonas Daniel Gerber, Veronika Stará +8
We measure telegraph noise of current fluctuations in an electrostatically defined quantum dot in bilayer graphene by real-time detection of single electron tunneling with a capaci…
Automated reconstruction of bound states in bilayer graphene quantum dots
Jozef Bucko, Frank Schäfer, František Herman +5
Bilayer graphene is a nanomaterial that allows for well-defined, separated quantum states to be defined by electrostatic gating and, therefore, provides an attractive platform to c…
Single-shot readout in graphene quantum dots
Lisa Maria Gächter, Rebekka Garreis, Chuyao Tong +9
Electrostatically defined quantum dots in bilayer graphene offer a promising platform for spin qubits with presumably long coherence times due to low spin-orbit coupling and low nu…
Pauli Blockade of Tunable Two-Electron Spin and Valley States in Graphene Quantum Dots
Chuyao Tong, Annika Kurzmann, Rebekka Garreis +9
Pauli blockade mechanisms -- whereby carrier transport through quantum dots is blocked due to selection rules even when energetically allowed -- are a direct manifestation of the P…
Kondo effect and spin-orbit coupling in graphene quantum dots
Annika Kurzmann, Yaakov Kleeorin, Chuyao Tong +12
The Kondo effect is a cornerstone in the study of strongly correlated fermions. The coherent exchange coupling of conduction electrons to local magnetic moments gives rise to a Kon…
Shell Filling and Trigonal Warping in Graphene Quantum Dots
Rebekka Garreis, Angelika Knothe, Chuyao Tong +8
Transport measurements through a few-electron circular quantum dot in bilayer graphene display bunching of the conductance resonances in groups of four, eight and twelve. This is i…
Internal Photo Effect from a Single Quantum Emitter
Pia Lochner, Jens Kerski, Annika Kurzmann +4
We demonstrate by time-resolved resonance fluorescence measurements on a single self-assembled quantum dot an internal photo-effect that emits electrons from the dot by an intra-ba…
Tunable valley splitting and bipolar operation in graphene quantum dots
Chuyao Tong, Rebekka Garreis, Angelika Knothe +8
Quantum states in graphene are four-fold degenerate: two fold in spins, and two fold in valleys.Both degrees of freedom can be utilized for qubit preparations. In our bilayer graph…
Coherent Jetting behind a gate-defined Channel in Bilayer Graphene
Carolin Gold, Angelika Knothe, Annika Kurzmann +6
Graphene has evolved as a platform for quantum transport that can compete with the best and cleanest semiconductor systems. Recently, many interesting local properties of carrier t…
Scanning Gate Microscopy of Localized States in a gate-defined Bilayer Graphene Channel
Carolin Gold, Annika Kurzmann, Kenji Watanabe +3
We use Scanning Gate Microscopy to demonstrate the presence of localized states arising from potential inhomogeneities in a 50nm-wide, gate-defined conducting channel in encapsulat…
Correlated electron-hole State in Twisted Double Bilayer Graphene
Peter Rickhaus, Folkert de Vries, Jihang Zhu +9
When twisted to angles near 1°, graphene multilayers provide a new window on electron correlation physics by hosting gate-tuneable strongly-correlated states, including insulators,…
Real-time detection of every Auger recombination in a self-assembled quantum dot
Pia Lochner, Annika Kurzmann, Jens Kerski +6
Auger recombination is a non-radiative process, where the recombination energy of an electron-hole pair is transferred to a third charge carrier. It is a common effect in colloidal…
Gap Opening in Twisted Double Bilayer Graphene by Crystal fields
Peter Rickhaus, Giulia Zheng, Jose L. Lado +12
Crystal fields occur due to a potential difference between chemically different atomic species. In Van-der-Waals heterostructures such fields are naturally present perpendicular to…
Tunable Valley Splitting due to Topological Orbital Magnetic Moment in Bilayer Graphene Quantum Point Contacts
Yongjin Lee, Angelika Knothe, Hiske Overweg +10
In multivalley semiconductors, the valley degree of freedom can be potentially used to store, manipulate and read quantum information, but its control remains challenging. The vall…
Fully automated identification of 2D material samples
Eliska Greplova, Carolin Gold, Benedikt Kratochwil +7
Thin nanomaterials are key constituents of modern quantum technologies and materials research. Identifying specimens of these materials with properties required for the development…
Large multi-directional spin-to-charge conversion in low symmetry semimetal MoTe at room temperature
C. K. Safeer, Nerea Ontoso, Josep Ingla-Aynés +11
Efficient and versatile spin-to-charge current conversion is crucial for the development of spintronic applications, which strongly rely on the ability to electrically generate and…
The Electronic Thickness of Graphene
Peter Rickhaus, Ming-Hao Liu, Marcin Kurpas +10
The van-der-Waals stacking technique enables the fabrication of heterostructures, where two conducting layers are atomically close. In this case, the finite layer thickness matters…
Excited states in bilayer graphene quantum dots
A. Kurzmann, M. Eich, H. Overweg +11
We report on ground- and excited state transport through an electrostatically defined few-hole quantum dot in bilayer graphene in both parallel and perpendicular applied magnetic f…
Charge detection in gate-defined bilayer graphene quantum dots
A. Kurzmann, H. Overweg, M. Eich +8
We report on charge detection in electrostatically-defined quantum dot devices in bilayer graphene using an integrated charge detector. The device is fabricated without any etching…
Optical detection of single electron transport dynamics
A. Kurzmann, P. Stegmann, J. Kerski +6
The unpredictability of a single quantum event lies at the very core of quantum mechanics. Physical information is therefore drawn from a statistical evaluation of many such proces…
Photon noise suppression by a built-in feedback loop
A. Al-Ashouri, A. Kurzmann, B. Merkel +4
Visionary quantum photonic networks need transform-limited single photons on demand. Resonance fluorescence on a quantum dot provides the access to a solid-state single photon sour…