The on-demand emission of coherent and indistinguishable electrons by independent synchronized sources is a challenging task quantum electronics, in particular regarding its application for information processing. Using two electron sources, we trigger the single-electron wavepackets at different inputs an electronic beamsplitter. Whereas classical particles would be randomly partitioned splitter, observe two-particle interferences resulting from exchange. Both electrons, emitted with...

What is the complex impedance of a fully coherent quantum resistance-capacitance (RC) circuit at gigahertz frequencies in which resistor and capacitor are connected series? While Kirchhoff's laws predict addition impedances, we report on observation different behavior. The resistance, here associated with charge relaxation, differs from usual transport resistance given by Landauer formula. In particular, for single-mode conductor, charge-relaxation half quantum, regardless transmission mode....

Quantum physics predicts that there is a fundamental maximum heat conductance across single transport channel, and this thermal quantum $G_Q$ universal, independent of the type particles carrying heat. Such universality, combined with relationship between information, signals general limit on information transfer. We report quantitative measurement limited flow for Fermi electronic using noise thermometry. The demonstrated agreement predicted establishes experimentally basic building block...

Two-dimensional systems can host exotic particles called anyons whose quantum statistics are neither bosonic nor fermionic. For example, the elementary excitations of fractional Hall effect at filling factor $\nu=1/m$ (where m is an odd integer) have been predicted to obey abelian statistics, with a phase $\varphi$ associated exchange two equal $\pi/m$. However, despite numerous experimental attempts, clear signatures remain elusive. Here we experimentally demonstrate $\nu=1/3$ by measuring...

We have determined the finite temperature coherence length of edge states in integer quantum Hall effect regime. This was realized by measuring visibility electronic Mach-Zehnder interferometers different sizes, at filling factor 2. The shows an exponential decay with temperature. characteristic scale is found inversely proportional to interferometer arm, allowing one define a ${l}_{\ensuremath{\varphi}}$. variations ${l}_{\ensuremath{\varphi}}$ magnetic field are same for all samples,...

We investigate the energy exchanges along an electronic quantum channel realized in integer Hall regime at filling factor $\nu_L=2$. One of two edge channels is driven out-of-equilibrium and resulting distribution measured outer channel, after several propagation lengths $0.8~\mu$m$\leq L\leq30~\mu$m. Whereas there are no discernable transfers toward thermalized states, we find efficient redistribution between without particle exchanges. At long distances $L\geq10~\mu$m, a hot Fermi function...

We present an original statistical method to measure the visibility of interferences in electronic Mach-Zehnder interferometer presence low frequency fluctuations. The presents a single side lobe structure shown result from Gaussian phase averaging whose variance is quadratic with bias. To reinforce our approach and validate method, same experiment also realized stable sample. It exhibits behavior as fluctuating one, indicating intrinsic character finite bias averaging. In both samples,...

Epitaxial growth of GaN nanowires on graphene is demonstrated using molecular beam epitaxy without any catalyst or intermediate layer. Growth highly selective with respect to silica which the flakes, grown by chemical vapor deposition, are transferred. The grow vertically along their c-axis and we observe a unique epitaxial relationship ⟨21̅1̅0⟩ directions wurtzite lattice parallel carbon zigzag chains. Remarkably, nanowire density height decrease increasing number layers underneath. We...

Coulomb interaction has a striking effect on electronic propagation in one dimensional conductors. The of an elementary excitation with neighboring conductors favors the emergence collective modes which eventually leads to destruction Landau quasiparticle. In this process, injected electron tends fractionalize into separated pulses carrying fraction charge. Here we use two-particle interferences analog Hong-Ou-Mandel experiment quantum Hall conductor at filling factor 2 probe fate single...

Quantum phase transitions are ubiquitous in many exotic behaviors of strongly-correlated materials. However the microscopic complexity impedes their quantitative understanding. Here, we observe thoroughly and comprehend rich physics two profoundly dissimilar regimes quantum criticality. With a circuit implementing simulator for three-channel Kondo model, reveal universal scalings toward different low-temperature fixed points along multiple crossovers from Notably, an unanticipated violation...

Recent pioneering works have set the stage for exploring anyon braiding statistics from negative current cross-correlations along two intersecting quasiparticle beams. In such a dual-source - analyzer quantum point contact setup, also referred to as 'collider', exchange phase of fractional Hall quasiparticles is predicted be imprinted into characterized by an effective Fano-factor $P$. case symmetric incoming beams, conventional fermions result in vanishing marked contrast, we observe...

The chiral edge channels in the quantum Hall regime are considered ideal ballistic channels, and have information processing potentialities. Here, we demonstrate experimentally, at filling factor 2, efficient tuning of energy relaxation that limits coherence permits return toward equilibrium. Energy along an channel is controllably enhanced by increasing its transmission a floating ohmic contact, quantitative agreement with predictions. Moreover, forming closed inner loop, freeze exchanges...

We demonstrate that it is possible to modulate the thermal emission through an electrical modulation of emissivity. The basic idea design a device where absorption due resonant phenomenon. If resonance can be electrically controlled, then and, therefore, controlled. this general concept using THz by surface phonon polaritons coupled gold grating. In our device, mostly mode confined in single quantum well (QW). emissivity controlled controlling refractive index gate voltage electron density....

Magnetic domain walls are topological solitons whose internal structure is set by competing energies which sculpt them. In common ferromagnets, known to be of either Bloch or N\'eel types. Little established in the case Mn$_3$Sn, a triangular antiferromagnet with large room-temperature anomalous Hall effect, where nucleation triggered well-defined threshold magnetic field. Here, we show that this system generate an additional contribution conductivity tensor and transverse magnetization. The...

In one-dimensional conductors, interactions result in correlated electronic systems. At low energy, a hallmark signature of the so-called Tomonaga-Luttinger liquids (TLL) is universal conductance curve predicted presence an impurity. A seemingly different topic quantum laws electricity, when distinct conductors are assembled circuit. particular, conductances suppressed at phenomenon called dynamical Coulomb blockade (DCB). Here we investigate mesoscopic circuits constituted by short...

Abstract Characterizing quantum states of the electromagnetic field at microwave frequencies requires fast and sensitive detectors that can simultaneously probe field’s time-dependent amplitude its fluctuations. So far, this has been achieved by using either homodyne detection or digitizers. Both methods rely on extraction radiation through an amplification chain towards detector placed room temperature, thereby limiting time resolution to ~10-GHz bandwidth measurement chain. Additionally,...

We have measured the magnetization of several single-layer, high-mobility 2D electron gas AlGaAs-GaAs heterostructures in quantum limit. Abrupt jumps are observed when an integer number Landau levels is filled. The width and magnitude identify incompressibility gaps energy spectrum order cyclotron energy, which a small fraction total states present. Sizable steps associated with spin splitting at odd filling factors (including...

We report on time-resolved measurements single GaAs quantum dots formed at the interface fluctuation of a $\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{Ga}\mathrm{As}$ well. measure exciton radiative lifetimes as short $100\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$, demonstrating that monolayer have larger oscillator strength than any other $\mathit{III}\text{\ensuremath{-}}\mathit{V}$ or $\mathit{II}\text{\ensuremath{-}}\mathit{VI}$ semiconductor dots. Studying various dots, we demonstrate dot is...