A5001212369- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and devices
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Electrowetting and Microfluidic Technologies
- Advanced Memory and Neural Computing
- Ferroelectric and Negative Capacitance Devices
- Analytical Chemistry and Sensors
Max Planck Institute for Solid State Research
2013-2020
SrTiO_{3} exhibits a superconducting dome upon doping with Nb, maximum critical temperature T_{c}≈0.4 K. Using microwave stripline resonators at frequencies from 2 to 23 GHz and temperatures down 0.02 K, we probe the low-energy optical response of charge carrier concentration 0.3 2.2×10^{20} cm^{-3}, covering majority dome. We find single-gap electrodynamics even though several electronic bands are superconducting. This is explained by single energy gap 2Δ due homogenization over Fermi...
The superconductor at the LaAlO3-SrTiO3 interface provides a model system for study of two-dimensional superconductivity in dilute carrier density limit. Here we experimentally address pairing mechanism this superconductor. We extract electron-phonon spectral function from tunneling spectra and conclude, without ruling out contributions further channels, that mediated is strong enough to account superconducting critical temperatures. Furthermore, discuss coupling relation phase diagram....
Abstract Solid‐state heterostructures are the cornerstone of modern electronics. To enhance functionality and performance integrated circuits, spectrum materials used in is being expanded by an increasing number compounds elements periodic table. While integration liquids solid–liquid interfaces into such systems would allow unique advanced functional properties enable nanoionic solid‐state that incorporate have not been considered thus far. Here with proposed, realized, characterized,...
A superconducting phase with an extremely low carrier density of the order cm−2 is present at LaAlO3–SrTiO3 interfaces. If depleted from charge carriers by means a gate field, this undergoes transition into metallic/insulating state that still characterized gap in spectral states. Measuring and analyzing critical field gap, we provide evidence macroscopically phase–coherent Cooper pairs are state. This fluctuating vortex–antivortex pairs, not individual, immobile pairs. The measurements...
The superconducting density of states the two-dimensional electron system at ${\mathrm{LaAlO}}_{3}--{\mathrm{SrTiO}}_{3}$ interface exhibits broad quasiparticle peaks that are well described by Dynes parameter $\mathrm{\ensuremath{\Gamma}}$. We measured $\mathrm{\ensuremath{\Gamma}}$ in a wide range temperatures and gate voltages using tunneling spectroscopy. ${T}^{q}$ temperature dependence, with $q=2.2\ifmmode\pm\else\textpm\fi{}0.2$. discuss several interpretations conclude is an...
Numerous two-dimensional superconductors exhibit a characteristic dome-shaped dependence of the critical temperature ${T}_{\mathrm{c}}$ on carrier density. The reduction with increasing charge density overdoped side this dome is frequently related to scattering arising from conduction in multiple bands. Multiband superconductivity can be resolved by tunneling spectroscopy, but interpretation spectroscopic data ambiguous. Superconductivity bands also expected affect upper field...
Field-effect gating with solid dielectrics is the basis for modern electronics. Electrolyte gating, however, offers far higher polarizations. Indeed, electrolyte has been a breakthrough to electrically induce numerous phase transitions in solids [1,2,3]. These experiments are all done by dripping mm-size drops of electrolytes onto active sample. Compared integrated circuit technology this approach seems "stone-age" us. open environment, and allow only limited purity reproducibility....