Signature of quantum interference effect in inter-layer Coulomb drag

We report the observations of low-field corrections to the Coulomb-scattering-dominated inter-layer drag resistance in graphene-based electronic double-layer systems. The corrections can be attributed to a new type of quantum interference between drag processes, with the interference pathway comprising different carrier diffusion paths in the two constituent layers. [More...]

Josephson-Coulomb drag effect between a normal conductor and a superconductor

Transport measurements between a normal conductor and a superconductor show that in this case the Coulomb drag response can be much larger than between two normal conductors. [More...]

Lifetime control of coupled plasmons

We demonstrate the lifetime manipulation of coupled Dirac plasmons by electric field-controlled damping pathways. One of the graphene layers serves as an external damping amplifier in graphene/BN/graphene heterostructure. This work provides a prototype design to actively control the lifetime of graphene plasmons and also broadens our horizon for the damping control of other quasiparticle systems. [More...]

Flat-band physics in kagome lattices

We report the experimental observation of flat bands in a paramagnetic kagome compound CoSn and demonstrate that these flat-band electrons are responsible for the anomalous and giant anisotropy in the transport and orbital magnetic properties. These findings broaden the already fascinating flat-band physics, and pave a definite way towards the exploration of flat-band physics in natural solid-state materials in addition to artificial ones. [More...]

Spontaneous folding growth of graphene on h-BN

We report the discovery of spontaneous folding growth of graphene on h-BN substrate using simple chemical vapor deposition method. Folded edges are formed when two stacked graphene layers share a joint edge at a growth temperature up to 1,300 °C. Utilizing this novel growth mode, hexagram bilayer graphene containing entirely sealed edges is eventually realized. [More...]

Zero-bias conductance peaks tuned by spin-orbit coupling

We report observations of pronounced zero-bias conductance peaks in hybrid junctions composed of LaAlO3/SrTiO3 and Nb. Remarkably, the zero-bias conductance peaks exhibit a dome-like dependence on the gate voltage which correlates strongly with the nonmonotonic gate-dependence of the Rashba spin-orbit coupling in the LaAlO3/SrTiO3. [More...]

Weyl physics in semiconductors

We reveal typical signatures of Weyl physics in the elemental semiconductor tellurium, including the negative longitudinal magnetoresistance, the planar Hall effect, as well as the intriguing log-periodic magneto-oscillations. Such Weyl semiconductors offer a simple platform for the exploration of novel Weyl physics and topological device applications based on semiconductors and moreover confirm the universality of discrete scale invariance in topological materials. [More...]

Moiré engineering in correlated oxides

Moiré engineering is a capable approach to control quantum phenomena in condensed matter systems, but it’s executed solely in stacked van der Waals systems. Herein, moiré engineering of oxides is achieved by tuning the coexistence and interaction of two distinct incommensurate patterns of strain modulation within the La0.67Sr0.33MnO3 thin films. [More...]

Drag effect between massless and massive fermions

We systematically study the fraction drag effect between massless and massive fermions in SLG/BLG heterostructures. The unique carrier density dependent features are revealed as a fingerprint feature for the massless-massive hybrid system. A generalized carrier dependent expression is obtained for the strong coupling regime. [More...]

Flatbands in kagome lattices

Flatband represents a highly degenerate and dispersionless manifold state of electronsmay offer unique opportunities for the emergence of exotic phases. We present the first experimental observation of a striking flatband near the Fermi level in Fe3Sn2 crystal. We also establish high-temperature ferromagnetic ordering and interpret the observed collective phenomenon as a consequence of the synergetic effect of electron correlation and peculiar lattice geometry. [More...]

Quantum control of graphene plasmons

The quantum control of plasmon excitation and propagation in graphene is demonstrated by adopting the variable quantum transmission of carriers at Heaviside potential steps as a tuning knob, which is dispensable process in building plasmon circuitry. [More...]

Plasmon-enhanced quantum coherence

We discover that when the electron-plasmon coupling is introduced, the quantum coherence of electrons in graphene is substantially enhanced with the quantum coherence length almost tripled. A microscopic model is developed to interpret the striking observations, emphasizing the vital role of the graphene plasmons in suppressing electron-electron dephasing. [More...]

Optically tuned spin-orbit coupling

We demonstrate that the Rashba spin-orbit coupling at the SrTiO₃-based interfaces is highly tunable by photoinduced charge doping, that is, optical gating. Such optical manipulation is nonvolatile and erasable, and is effective enough to tune the interferences of Bloch wave functions from constructive to destructive, realizing a transition from weak localization to weak antilocalization. [More...]

Quantum percolation in magnganites nanowires

We reveal that the extreme 1D confinement on the electronically phase-separated manganites is very sensitive to the order parameter fluctuations and even manipulates the phase stability, eventually leading to emergent physical effects. [More...]

Electronic structures of vdWs hetero- structures MoSe2/hBN/Ru(0001)

We discover the bandgap renormalization and work function tuning in MoSe2/hBN/Ru(0001) hetero- structures. The electronic structure and the work function of MoSe2 are modulated electrostatically and this electrostatic modulation is spatially in phase with the Moire´ pattern of hBN on Ru(0001). [More...]