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Continuous Tuning of the Charge-Phase Uncertainty in a Josephson Junction
Irena Padniuk, Xianzhe Zeng, Juan Carlos Cuevas +3
Quantum mechanics constrains conjugate observables from being simultaneously measurable with arbitrary precision. In a Josephson junction, these are the transferred electric charge…
Enhancing the Energy Resolution in Scanning Tunneling Microscopy: from dynamical Coulomb blockade to cavity quantum electrodynamics
Xianzhe Zeng, Janis Siebrecht, Haonan Huang +4
Scanning tunneling microscopy and spectroscopy have become indispensable tools for probing condensed matter at atomic length scales, yet achieving ultimate energy resolution remain…
Josephson tunneling through a Yu-Shiba-Rusinov state: Interplay of -shifts in Josephson current and local superconducting order parameter
Andreas Theiler, Christian R. Ast, Annica M. Black-Schaffer
An impurity hosting a magnetic moment coupled to a conventional -wave superconductor gives rise to so-called Yu-Shiba-Rusinov (YSR) states with energies inside the superconducti…
Temperature dependent energy gap for Yu-Shiba-Rusinov states at the quantum phase transition
Andreas Theiler, Christian R. Ast, Annica M. Black-Schaffer
Motivated by recent experiments, which allow for fine tuning of the effective magnetic interaction between the impurity and the superconductor, we investigate the regime around the…
Tracking a Spin-Polarized Superconducting Bound State across a Quantum Phase Transition
Sujoy Karan, Haonan Huang, Alexander Ivanovic +5
The magnetic exchange coupling between magnetic impurities and a superconductor induce so-called Yu-Shiba-Rusinov (YSR) states which undergo a quantum phase transition (QPT) upon i…
Microwave Excitation of Atomic Scale Superconducting Bound States
Janis Siebrecht, Haonan Huang, Piotr Kot +6
Magnetic impurities on superconductors lead to bound states within the superconducting gap, so called Yu-Shiba-Rusinov (YSR) states. They are parity protected, which enhances their…
Universal scaling of tunable Yu-Shiba-Rusinov states across the quantum phase transition
Haonan Huang, Sujoy Karan, Ciprian Padurariu +5
Quantum magnetic impurities give rise to a wealth of phenomena attracting tremendous research interest in recent years. On a normal metal, magnetic impurities generate the correlat…
Tunneling processes between Yu-Shiba-Rusinov bound states
A. Villas, R. L. Klees, G. Morrás +5
Very recent experiments have reported the tunneling between Yu-Shiba-Rusinov (YSR) bound states at the atomic scale. These experiments have been realized with the help of a scannin…
Extracting the Transport Channel Transmissions in Scanning Tunneling Microscopy using the Superconducting Excess Current
Jacob Senkpiel, Robert Drost, Jan C. Klöckner +6
Transport through quantum coherent conductors, like atomic junctions, is described by the distribution of conduction channels. Information about the number of channels and their tr…
Superconducting Quantum Interference at the Atomic Scale
S. Karan, H. Huang, C. Padurariu +9
A single spin in a Josephson junction can reverse the flow of the supercurrent. At mesoscopic length scales, such -junctions are employed in various instances from finding the p…
Spin-dependent tunneling between individual superconducting bound states
Haonan Huang, Jacob Senkpiel, Ciprian Padurariu +9
Magnetic impurities on superconductors induce discrete bound levels inside the superconducting gap, known as Yu-Shiba-Rusinov (YSR) states. YSR levels are fully spin-polarized such…
Interplay Between Yu-Shiba-Rusinov States and Multiple Andreev Reflections
Alberto Villas, Raffael L. Klees, Haonan Huang +4
Motivated by recent scanning tunneling microscopy experiments on single magnetic impurities on superconducting surfaces, we present here a comprehensive theoretical study of the in…
Microwave-assisted tunneling and interference effects in superconducting junctions under fast driving signals
Piotr Kot, Robert Drost, Maximilian Uhl +3
As scanning tunneling microscopy is pushed towards fast local dynamics, a quantitative understanding of tunnel junctions under the influence of a fast AC driving signal is required…
Tunneling dynamics between superconducting bound states at the atomic limit
Haonan Huang, Ciprian Padurariu, Jacob Senkpiel +7
Despite plenty of room at the bottom, there is a limit to the miniaturization of every process. For charge transport this is realized by the coupling of single discrete energy leve…
Magnetic Impurities on Superconducting Surfaces: Phase Transitions and the Role of Impurity-Substrate Hybridization
Haonan Huang, Robert Drost, Jacob Senkpiel +7
Spin-dependent scattering from magnetic impurities inside a superconductor gives rise to Yu-Shiba-Rusinov (YSR) states within the superconducting gap. As such, YSR states have been…
Single Channel Josephson Effect in a High Transmission Atomic Contact
Jacob Senkpiel, Simon Dambach, Markus Etzkorn +9
The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of the superconducting order parameter on a local scale through the Ambegao…
Mapping of Yu-Shiba-Rusinov states from an extended scatterer
Markus Etzkorn, Matthias Eltschka, Berthold Jäck +2
We investigate the spatial evolution of Yu-Shiba-Rusinov (YSR) states resulting from the interaction between Copper phthalocyanine molecules and a superconducting Vanadium (100) su…
Robustness of Yu-Shiba-Rusinov resonances in presence of a complex superconducting order parameter
Jacob Senkpiel, Carmen Rubio-Verdú, Markus Etzkorn +8
Robust quantum systems rely on having a protective environment with minimized relaxation channels. Superconducting gaps play an important role in the design of such environments. T…
Critical Josephson current in the dynamical Coulomb blockade regime
Berthold Jäck, Matthias Eltschka, Maximilian Assig +3
Superconductivity is commonly described as a macroscopic quantum phenomenon. However, it arises from microscopic mechanisms occurring at the nanometer scale as illustrated, for exa…
The energy resolution function of a tunnel junction
Christian R. Ast, Berthold Jäck, Jacob Senkpiel +4
The tunnel junction between tip and sample in a scanning tunneling microscope is an ideal platform to access the local density of states in the sample through the differential cond…
Evidence for superconductivity in Li-decorated monolayer graphene
Bart Ludbrook, Giorgio Levy, Pascal Nigge +13
Monolayer graphene exhibits many spectacular electronic properties, with superconductivity being arguably the most notable exception. It was theoretically proposed that superconduc…
Unusual electronic ground state of a prototype cuprate: band splitting of single CuO_2-plane Bi_2 Sr_(2-x) La_x CuO_(6+delta)
C. Janowitz, R. Mueller, L. Dudy +4
By in-situ change of polarization a small splitting of the Zhang-Rice singlet state band near the Fermi level has been resolved for optimum doped (x=0.4) BiSrLa…