Search

Readout of remote spins in quantum dot arrays is a challenge for future quantum computing architectures. Here, the authors implement electron cascade for spin readout on quantum dots far away from a charge sensor in a quadruple quantum dot device and discuss its applicability to large-scale arrays.

Using a system to adjust the strength of cavity vacuum fields penetrating a Hall bar, a study describes the effect of the vacuum field of a cavity on electronic correlations in quantum Hall systems.

Topological superconductivity, a state that can support the formation of Majorana zero modes, can be induced in the edge state of a InAs/GaSb nanowire.

Two electron spins occupying the outer dots in a linear array of three quantum dots experience a coherent superexchange interaction through the empty middle dot that acts as a quantum mediator.

A study of Mn-doped InAs quantum wells reveals unexpected metastable behaviour of magnetotransport phenomena at sub-kelvin temperatures, in structures that show at the same time the quantum Hall effect in high magnetic fields. These findings bridge the physics of two-dimensional carrier systems with phenomena specific to magnetically doped semiconductors.

The authors study Andreev bound states (ABSs) in 3-terminal InAs/Al Josephson-junction devices. They find signatures of hybridization between two ABSs, with band structure tunable by electric currents that generate magnetic fluxes threading superconducting loops in the device.

The authors study conductance replicas emerging under microwave irradiation in the tunnelling spectrum of Josephson junctions in InAs/Al heterostructures, focusing on distinguishing the signatures of Floquet-Andreev states (FASs) from those of photon-assisted tunneling (PAT). They establish that PAT largely dominates the response to microwave radiation in their device.

Graphene's broad bandwidth makes it promising as a photodetector, but common electronics cannot analyse the currents at high frequencies. Here, using photocurrent measurements, laser-induced carrier generation effects in freely suspended graphene and at graphene–metal interfaces are clarified up to 1 THz.

By combining an asymmetric immersion lens setup and a complementary resonating metasurface, the authors are able to resolve the far-field transmission of an ultrastrongly coupled, highly subwavelength split-ring single resonator at millimeter wavelengths.

One of the challenges in maintaining quantum coherence in semiconductor devices is coping with the fluctuating magnetic field generated by nearby nuclear spins. Here the authors explore the functioning of a feedback mechanism between electron and nuclear spins that extends the coherence time of a many-electron quantum dot.

The ‘0.7-anomaly’ — an unexpected feature in the conductance of a quantum point contact — is shown to originate in a smeared van Hove singularity in the local density of states at the bottom of the lowest one-dimensional subband of the point contact.

Nonlinear optical measurements in a two-dimensional electron system embedded in an optical cavity show enhanced polariton–polariton interactions in the fractional quantum Hall regime.

Equilibrium transport phenomena known as fractional quantum Hall effects (FQHE) have elucidated the quantum ground states of interacting many-body systems. This study of FQHE transport in the non-equilibrium context finds a bimodal dc-bias-induced splitting of canonical FQHE, a diamond pattern in the resistance minima trajectories vs. the magnetic field and the dc-bias, and excited-state FQHE.