Michael Hell
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View article: Band structure and end states in InAs/GaSb core-shell-shell nanowires
Band structure and end states in InAs/GaSb core-shell-shell nanowires Open
Quantum wells in InAs/GaSb heterostructures can be tuned to a topological\nregime associated with the quantum spin Hall effect, which arises due to an\ninverted band gap and hybridized electron and hole states. Here, we investigate\nelectr…
View article: Band structure and end states in InAs/GaSb core-shell-shell nanowires
Band structure and end states in InAs/GaSb core-shell-shell nanowires Open
Quantum wells in InAs/GaSb heterostructures can be tuned to a topological regime associated with the quantum spin Hall effect, which arises due to an inverted band gap and hybridized electron and hole states. Here, we investigate electron-…
View article: Hybridization of Subgap States in One-Dimensional Superconductor-Semiconductor Coulomb Islands
Hybridization of Subgap States in One-Dimensional Superconductor-Semiconductor Coulomb Islands Open
We present measurements of one-dimensional superconductor-semiconductor Coulomb islands, fabricated by gate confinement of a two-dimensional InAs heterostructure with an epitaxial Al layer. When tuned via electrostatic side gates to regime…
View article: Four-Majorana qubit with charge readout: Dynamics and decoherence
Four-Majorana qubit with charge readout: Dynamics and decoherence Open
We present a theoretical analysis of a Majorana-based qubit consisting of two\ntopological superconducting islands connected via a Josephson junction. The\nqubit is operated by electrostatic gates which control the coupling of two of\nthe …
View article: Distinguishing Majorana bound states from localized Andreev bound states by interferometry
Distinguishing Majorana bound states from localized Andreev bound states by interferometry Open
Experimental evidence for Majorana bound states (MBSs) is so far mainly based\non the robustness of a zero-bias conductance peak. However, similar features\ncan also arise due to Andreev bound states (ABSs) localized at the end of an\nisla…
View article: Anharmonicity of a superconducting qubit with a few-mode Josephson junction
Anharmonicity of a superconducting qubit with a few-mode Josephson junction Open
Coherent operation of gate-voltage-controlled hybrid transmon qubits\n(gatemons) based on semiconductor nanowires was recently demonstrated. Here we\nexperimentally investigate the anharmonicity in epitaxial InAs-Al Josephson\njunctions, a…
View article: Publisher's Note: Coupling and braiding Majorana bound states in networks defined in two-dimensional electron gases with proximity-induced superconductivity [Phys. Rev. B 96, 035444 (2017)]
Publisher's Note: Coupling and braiding Majorana bound states in networks defined in two-dimensional electron gases with proximity-induced superconductivity [Phys. Rev. B 96, 035444 (2017)] Open
Received 8 September 2017DOI:https://doi.org/10.1103/PhysRevB.96.119906©2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAnyonsProximity effectPhysical SystemsTopological superconductorsTwo-dimensional electron g…
View article: Coupling and braiding Majorana bound states in networks defined in two-dimensional electron gases with proximity-induced superconductivity
Coupling and braiding Majorana bound states in networks defined in two-dimensional electron gases with proximity-induced superconductivity Open
Two-dimensional electron gases with strong spin-orbit coupling covered by a\nsuperconducting layer offer a flexible and potentially scalable platform for\nMajorana networks. We predict Majorana bound states (MBSs) to appear for\nexperiment…
View article: Two-Dimensional Platform for Networks of Majorana Bound States
Two-Dimensional Platform for Networks of Majorana Bound States Open
We model theoretically a two-dimensional electron gas (2DEG) covered by a superconductor and demonstrate that topological superconducting channels are formed when stripes of the superconducting layer are removed. As a consequence, Majorana…
View article: Time scales for Majorana manipulation using Coulomb blockade in gate-controlled superconducting nanowires
Time scales for Majorana manipulation using Coulomb blockade in gate-controlled superconducting nanowires Open
We numerically compute the low-energy spectrum of a gate-controlled\nsuperconducting topological nanowire segmented into two islands, each\nJosephson-coupled to a bulk superconductor. This device may host two pairs of\nMajorana bound state…
View article: Qubit quantum-dot sensors: Noise cancellation by coherent backaction, initial slips, and elliptical precession
Qubit quantum-dot sensors: Noise cancellation by coherent backaction, initial slips, and elliptical precession Open
We theoretically investigate the backaction of a sensor quantum dot with\nstrong local Coulomb repulsion on the transient dynamics of a qubit that is\nprobed capacitively. We show that the measurement backaction induced by the\nnoise of el…