M. A. Kastner
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View article: Extended Fractional Chern Insulators Near Half Flux in Twisted Bilayer Graphene Above the Magic Angle
Extended Fractional Chern Insulators Near Half Flux in Twisted Bilayer Graphene Above the Magic Angle Open
Fractional Chern insulators (FCIs) -- the lattice analog of fractional quantum Hall states -- form as fractionalized quasiparticles emerge in a partially-filled Chern band. This fractionalization is driven by the interplay of electronic in…
View article: Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices
Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices Open
The electronic properties of moiré heterostructures depend sensitively on the relative orientation between layers of the stack. For example, near-magic-angle twisted bilayer graphene (TBG) commonly shows superconductivity, yet a TBG sample…
View article: Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor
Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor Open
Dataset and analysis code accompanying the manuscript "Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor," available at https://arxiv.org/abs/2110.01039. This dataset includes measuremen…
View article: Quantitative determination of twist angle and strain in Van der Waals moiré superlattices
Quantitative determination of twist angle and strain in Van der Waals moiré superlattices Open
Scanning probe techniques are popular, non-destructive ways to visualize the real space structure of Van der Waals moirés. The high lateral spatial resolution provided by these techniques enables extracting the moiré lattice vectors from a…
View article: Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices
Deterministic fabrication of graphene hexagonal boron nitride moiré superlattices Open
The electronic properties of moiré heterostructures depend sensitively on the relative orientation between layers of the stack. For example, near-magic-angle twisted bilayer graphene (TBG) commonly shows superconductivity, yet a TBG sample…
View article: Torsional force microscopy of van der Waals moirés and atomic lattices
Torsional force microscopy of van der Waals moirés and atomic lattices Open
In a stack of atomically thin van der Waals layers, introducing interlayer twist creates a moiré superlattice whose period is a function of twist angle. Changes in that twist angle of even hundredths of a degree can dramatically transform …
View article: Universal Conductance Fluctuations in a MnBi<sub>2</sub>Te<sub>4</sub> Thin Film
Universal Conductance Fluctuations in a MnBi<sub>2</sub>Te<sub>4</sub> Thin Film Open
Quantum coherence of electrons can produce striking behaviors in mesoscopic conductors. Although magnetic order can also strongly affect transport, the combination of coherence and magnetic order has been largely unexplored. Here, we exami…
View article: Torsional Force Microscopy of Van der Waals Moirés and Atomic Lattices
Torsional Force Microscopy of Van der Waals Moirés and Atomic Lattices Open
In a stack of atomically-thin Van der Waals layers, introducing interlayer twist creates a moiré superlattice whose period is a function of twist angle. Changes in that twist angle of even hundredths of a degree can dramatically transform …
View article: Unusual magnetotransport in twisted bilayer graphene from strain-induced open Fermi surfaces
Unusual magnetotransport in twisted bilayer graphene from strain-induced open Fermi surfaces Open
Anisotropic hopping in a toy Hofstadter model was recently invoked to explain a rich and surprising Landau spectrum measured in twisted bilayer graphene away from the magic angle. Suspecting that such anisotropy could arise from unintended…
View article: Universal conductance fluctuations in a MnBi$_2$Te$_4$ thin film
Universal conductance fluctuations in a MnBi$_2$Te$_4$ thin film Open
Quantum coherence of electrons can produce striking behaviors in mesoscopic conductors, including weak localization and the Aharonov-Bohm effect. Although magnetic order can also strongly affect transport, the combination of coherence and …
View article: Meta Reviewers
Meta Reviewers Open
View article: Low-damage electron beam lithography for nanostructures on Bi2Te3-class topological insulator thin films
Low-damage electron beam lithography for nanostructures on Bi2Te3-class topological insulator thin films Open
Nanostructured topological insulators (TIs) have the potential to impact a wide array of condensed matter physics topics, ranging from Majorana physics to spintronics. However, the most common TI materials, the Bi2Se3 family, are easily da…
View article: A clean ballistic quantum point contact in strontium titanate
A clean ballistic quantum point contact in strontium titanate Open
View article: Quantum simulation of an exotic quantum critical point in a two-site charge Kondo circuit
Quantum simulation of an exotic quantum critical point in a two-site charge Kondo circuit Open
View article: Low-damage electron beam lithography for nanostructures on Bi$_2$Te$_3$-class topological insulator thin films
Low-damage electron beam lithography for nanostructures on Bi$_2$Te$_3$-class topological insulator thin films Open
Nanostructured topological insulators (TIs) have the potential to impact a wide array of condensed matter physics topics, ranging from Majorana physics to spintronics. However, the most common TI materials, the Bi$_2$Se$_3$ family, are eas…
View article: Contact-independent electrical conductance measurement
Contact-independent electrical conductance measurement Open
Electrical conductance measurement system including a one-dimensional semiconducting channel, with electrical conductance sensitive to electrostatic fluctuations, in a circuit for measuring channel electrical current. An electrically-condu…
View article: Measured Potential Profile in a Quantum Anomalous Hall System Suggests Bulk-Dominated Current Flow
Measured Potential Profile in a Quantum Anomalous Hall System Suggests Bulk-Dominated Current Flow Open
Ideally, quantum anomalous Hall systems should display zero longitudinal resistance. Yet in experimental quantum anomalous Hall systems elevated temperature can make the longitudinal resistance finite, indicating dissipative flow of electr…
View article: Unusual magnetotransport in twisted bilayer graphene from strain-induced open Fermi surfaces
Unusual magnetotransport in twisted bilayer graphene from strain-induced open Fermi surfaces Open
Anisotropic hopping in a toy Hofstadter model was recently invoked to explain a rich and surprising Landau spectrum measured in twisted bilayer graphene away from the magic angle. Suspecting that such anisotropy could arise from unintended…
View article: Observation of a phase transition within the domain walls of ferromagnetic Co3Sn2S2
Observation of a phase transition within the domain walls of ferromagnetic Co3Sn2S2 Open
View article: Clean quantum point contacts in an InAs quantum well grown on a lattice-mismatched InP substrate
Clean quantum point contacts in an InAs quantum well grown on a lattice-mismatched InP substrate Open
Strong spin-orbit coupling, the resulting large $g$ factor, and small effective mass make InAs an attractive material platform for inducing topological superconductivity. The surface Fermi level pinning in the conduction band enables highl…
View article: Controlling graphene-hBN rotational alignment.
Controlling graphene-hBN rotational alignment. Open
View article: Clean quantum point contacts in an InAs quantum well grown on a\n lattice-mismatched InP substrate
Clean quantum point contacts in an InAs quantum well grown on a\n lattice-mismatched InP substrate Open
Strong spin-orbit coupling, the resulting large $g$ factor, and small\neffective mass make InAs an attractive material platform for inducing\ntopological superconductivity. The surface Fermi level pinning in the\nconduction band enables hi…
View article: Magnetic anisotropy in twisted bilayer graphene and ABC-trilayer graphene aligned with hexagonal boron nitride.
Magnetic anisotropy in twisted bilayer graphene and ABC-trilayer graphene aligned with hexagonal boron nitride. Open
this property, we argue that the QAH effect is likely only when (i) the (θGG, θGBN) twist-angle-pair is close enough to a commensurate point that the two moiré patterns yield a supermoiré pattern with a sufficiently long length scale, and …
View article: QAH potential profile measurements
QAH potential profile measurements Open
Dataset and analysis code accompanying the manuscript "Measured potential profile in a quantum anomalous Hall system suggests bulk-dominated current flow," available at https://arxiv.org/abs/2112.13123. Simulation code available at https:/…
View article: Tunable Orbital Ferromagnetism at Noninteger Filling of a Moiré Superlattice
Tunable Orbital Ferromagnetism at Noninteger Filling of a Moiré Superlattice Open
The flat bands resulting from moiré superlattices exhibit fascinating correlated electron phenomena such as correlated insulators, ( Nature 2018, 556 (7699), 80-84), ( Nature Physics 2019, 15 (3), 237) superconductivity, (
View article: Clean ballistic quantum point contact in SrTiO$_3$
Clean ballistic quantum point contact in SrTiO$_3$ Open
Two dimensional electron gases based on SrTiO$_3$ are an intriguing platform for exploring mesoscopic superconductivity combined with spin-orbit coupling, offering electrostatic tunability from insulator to metal to superconductor within a…
View article: Data for "Clean ballistic quantum point contact in SrTiO3"
Data for "Clean ballistic quantum point contact in SrTiO3" Open
Spreadsheets containing raw data, axis and trace labels from submitted manuscript "Clean ballistic quantum point contact in SrTiO3".
View article: Data for "Clean ballistic quantum point contact in SrTiO3"
Data for "Clean ballistic quantum point contact in SrTiO3" Open
Spreadsheets containing raw data, axis and trace labels from submitted manuscript "Clean ballistic quantum point contact in SrTiO3".
View article: Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor
Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor Open
A lateral Josephson junction in which the surface of a 3D topological insulator serves as the weak link should support topologically protected excitations related to Majorana fermions. The resulting $4π$-periodic current-phase relationship…
View article: Quantum Imaging of Single-Atom Spin-Splitting in a Monolayer\n Semiconductor
Quantum Imaging of Single-Atom Spin-Splitting in a Monolayer\n Semiconductor Open
Theoretical work has suggested that monolayer MoS2 doped with Mn should\nbehave as a two-dimensional dilute magnetic semiconductor, which would open up\npossibilities for spintronic applications, device physics, and novel ground\nstates. T…