Scientific Publications
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Gate-driven sliding between Bernal and rhombohedral stacking in double-bilayer graphene enables non-volatile switching between a non-magnetic and a ferromagnetic phase, with an anomalous Hall effect that likely originates from stacking domain boundaries.

We demonstrate a reversible, field-free superconducting diode effect in aluminum proximitized by the collinear antiferromagnet CuMnAs, with polarity set by the Néel state, showing that neither spin splitting nor net magnetization is required.

We compare two primary electronic thermometers, Coulomb blockade and shot noise, finding agreement within ~2.5% from 20 to 235 mK. Uncertainty in the shot noise thermometer’s measurement frequency dominates at low temperatures.

Scanning tunneling microscopy and spectroscopy have become indispensable tools for probing condensed matter at atomic length scales, yet achieving ultimate energy resolution remains a persistent challenge. At mK temperatures, the dynamical Coulomb blockade..

The SRD1000 is a superconducting reference device providing fixed-point temperature references between 15 mK and 1.2 K and is a robust tool for the practical dissemination of PLTS-2000. The long-term stability of SRD1000 serial number SN 005 is investigated by comparing superconducting transition measurements conducted in 2002 and again in 2023...

Electrons in topological flat bands can form new topological states driven by correlation effects. The pentalayer rhombohedral graphene/hexagonal boron nitride (hBN) moiré superlattice was shown to host fractional quantum anomalous Hall effect (FQAHE) at approximately 400 mK (ref. 1),..

Spin-polarized superconductors offer a rare platform for studying electronic correlations, but few candidate systems have been experimentally confirmed to date. Here, we report the observation of a spin-polarized superconducting state, denoted SC5, in WSe2-proximitized rhombohedral trilayer graphene...

Using a mesoscopic antidot in moiré rhombohedral graphene, we find one-electron-charge quasiparticles at both ν = 1 and 2/3 at low temperatures, indicating a phase transition from a fractional Chern insulator, not edge-state non-equilibration.

We observe the long-sought 1/3 fractional quantum anomalous Hall state in rhombohedral pentalayer graphene/hBN, with a record thermodynamic gap of ~7 K for graphene, and show the extended quantum anomalous Hall state is gapless.

The emergence of high-transition-temperature (Tc) superconductivity in strongly correlated materials remains the main unsolved problem in physics. High-Tc materials, such as cuprates, are generally complex and not easily tunable, making theoretical modelling difficult...

In semiconductor hole spin qubits, low magnetic field (B) operation extends the coherence time (T2*) but proportionally reduces the gate speed. In contrast, singlet-triplet (ST) qubits are primarily controlled by the exchange interaction (J) and can thus maintain high gate speeds even at low B. ...

Coulomb blockade thermometers (CBTs) are versatile and, in principle, primary thermometers operating down to the micro-Kelvin range but bias heating spoils the thermometry and the primary mode. Here, we introduce a method to extract the CBT electron temperature in the presence of heat created by an arbitrary bias voltage, and without assumptions on the heat flow mechanisms...

Josephson junctions (JJs) are key to superconducting quantum technologies and the search for self-conjugate quasiparticles potentially useful for fault-tolerant quantum computing. In topological insulator (TI)–based JJs, measuring the current-phase relation (CPR) can reveal unconventional effects such as Majorana bound states (MBS) and nonreciprocal transport...

Chiral superconductors are unconventional superconducting states that break time-reversal symmetry spontaneously and typically feature Cooper pairing at non-zero angular momentum. Such states may host Majorana fermions and provide an important platform for topological physics research and fault-tolerant quantum computing...