Anton Potočnik
ETH Zurich
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Featured researches published by Anton Potočnik.
Proceedings of the National Academy of Sciences of the United States of America | 2010
Mojca Vilfan; Anton Potočnik; Blaž Kavčič; Natan Osterman; Igor Poberaj; Andrej Vilfan; Dušan Babič
Due to their small dimensions, microfluidic devices operate in the low Reynolds number regime. In this case, the hydrodynamics is governed by the viscosity rather than inertia and special elements have to be introduced into the system for mixing and pumping of fluids. Here we report on the realization of an effective pumping device that mimics a ciliated surface and imitates its motion to generate fluid flow. The artificial biomimetic cilia are constructed as long chains of spherical superparamagnetic particles, which self-assemble in an external magnetic field. Magnetic field is also used to actuate the cilia in a simple nonreciprocal manner, resulting in a fluid flow. We prove the concept by measuring the velocity of a cilia-pumped fluid as a function of height above the ciliated surface and investigate the influence of the beating asymmetry on the pumping performance. A numerical simulation was carried out that successfully reproduced the experimentally obtained data.
Nature | 2010
Alexey Y. Ganin; Yasuhiro Takabayashi; P. Jeglič; Denis Arčon; Anton Potočnik; P. J. Baker; Yasuo Ohishi; Martin T. McDonald; Manolis D. Tzirakis; Alec McLennan; George R. Darling; Masaki Takata; Matthew J. Rosseinsky; Kosnnas Prassides
The crystal structure of a solid controls the interactions between the electronically active units and thus its electronic properties. In the high-temperature superconducting copper oxides, only one spatial arrangement of the electronically active Cu2+ units—a two-dimensional square lattice—is available to study the competition between the cooperative electronic states of magnetic order and superconductivity. Crystals of the spherical molecular C603- anion support both superconductivity and magnetism but can consist of fundamentally distinct three-dimensional arrangements of the anions. Superconductivity in the A3C60 (A = alkali metal) fullerides has been exclusively associated with face-centred cubic (f.c.c.) packing of C603- (refs 2, 3), but recently the most expanded (and thus having the highest superconducting transition temperature, Tc; ref. 4) composition Cs3C60 has been isolated as a body-centred cubic (b.c.c.) packing, which supports both superconductivity and magnetic order. Here we isolate the f.c.c. polymorph of Cs3C60 to show how the spatial arrangement of the electronically active units controls the competing superconducting and magnetic electronic ground states. Unlike all the other f.c.c. A3C60 fullerides, f.c.c. Cs3C60 is not a superconductor but a magnetic insulator at ambient pressure, and becomes superconducting under pressure. The magnetic ordering occurs at an order of magnitude lower temperature in the geometrically frustrated f.c.c. polymorph (Néel temperature TN = 2.2 K) than in the b.c.c.-based packing (TN = 46 K). The different lattice packings of C603- change Tc from 38 K in b.c.c. Cs3C60 to 35 K in f.c.c. Cs3C60 (the highest found in the f.c.c. A3C60 family). The existence of two superconducting packings of the same electronically active unit reveals that Tc scales universally in a structure-independent dome-like relationship with proximity to the Mott metal–insulator transition, which is governed by the role of electron correlations characteristic of high-temperature superconducting materials other than fullerides.
Physical Review X | 2015
Yves Salathe; Mintu Mondal; Markus Oppliger; Johannes Heinsoo; Philipp Kurpiers; Anton Potočnik; Antonio Mezzacapo; Urtzi Las Heras García; Lucas Lamata Manuel; Enrique Leónidas Solano Villanueva; Stefan Filipp; A. Wallraff
Systems of interacting quantum spins show a rich spectrum of quantum phases and display interesting many-body dynamics. Computing characteristics of even small systems on conventional computers poses significant challenges. A quantum simulator has the potential to outperform standard computers in calculating the evolution of complex quantum systems. Here, we perform a digital quantum simulation of the paradigmatic Heisenberg and Ising interacting spin models using a two transmon-qubit circuit quantum electrodynamics setup. We make use of the exchange interaction naturally present in the simulator to construct a digital decomposition of the model-specific evolution and extract its full dynamics. This approach is universal and efficient, employing only resources which are polynomial in the number of spins and indicates a path towards the controlled simulation of general spin dynamics in superconducting qubit platforms.
Langmuir | 2014
Manca Logar; Ines Bračko; Anton Potočnik; Boštjan Jančar
3D network configurations of copper(II) oxide/titanate nanobelt (CuO/TiNBs) and copper/titanate nanobelt (Cu/TiNBs) were formed using a two-step polyelectrolyte-assisted synthesis and assembly approach. The photoactivity of the TiNB/CuO and Cu/TiNB composite networks is significantly enhanced as compared to the activity of 3D structures formed of pristine TiNB. An efficient, UV-vis-light-induced electron transfer at the two-component interface achieved by the intimate coupling of TiNB with p-type semiconducting CuO and plasmonic Cu nanoparticles in composite heterostructures facilitates control over the systems exciton dynamics, which results in highly efficient UV-vis photocatalytic performance of heterostructures. The superior photocatalytic activity of the metal and semiconductor/semiconductor nanocomposite structures in the visible region is discussed, highlighting the role of interfacial electron-charge transfer (IFCT) in semiconductor-semiconductor (CuO/TiNB) and surface plasmon resonance (SPR) of Cu nanoparticles in metal-semiconductor heterostructures.
Science Advances | 2015
Ruth H. Zadik; Yasuhiro Takabayashi; Gyoengyi Klupp; Ross H. Colman; Alexey Y. Ganin; Anton Potočnik; P. Jeglič; Denis Arčon; Péter Matus; Katalin Kamarás; Yuichi Kasahara; Yoshihiro Iwasa; Andrew N. Fitch; Yasuo Ohishi; Gaston Garbarino; Kenichi Kato; Matthew J. Rosseinsky; Kosmas Prassides
A superconductivity dome is created by the electronic structure of the molecular building block of an unconventional superconductor. Understanding the relationship between the superconducting, the neighboring insulating, and the normal metallic state above Tc is a major challenge for all unconventional superconductors. The molecular A3C60 fulleride superconductors have a parent antiferromagnetic insulator in common with the atom-based cuprates, but here, the C603– electronic structure controls the geometry and spin state of the structural building unit via the on-molecule Jahn-Teller effect. We identify the Jahn-Teller metal as a fluctuating microscopically heterogeneous coexistence of both localized Jahn-Teller–active and itinerant electrons that connects the insulating and superconducting states of fullerides. The balance between these molecular and extended lattice features of the electrons at the Fermi level gives a dome-shaped variation of Tc with interfulleride separation, demonstrating molecular electronic structure control of superconductivity.
Physical Review Letters | 2011
Andrej Zorko; P. Jeglič; Anton Potočnik; Denis Arčon; A. Balčytis; Zvonko Jagličić; Xiaohui Liu; Andrei L. Tchougréeff; Richard Dronskowski
We have investigated the magnetic properties of CuNCN, the first nitrogen-based analog of cupric oxide CuO. Our muon-spin relaxation, nuclear magnetic resonance, and electron-spin resonance studies reveal that classical magnetic ordering is absent down to the lowest temperatures. However, a large enhancement of spin correlations and an unexpected inhomogeneous magnetism have been observed below 80 K. We attribute this to a peculiar fragility of the electronic state against weak perturbations due to geometrical frustration, which selects between competing spin-liquid and more conventional frozen states.
Physical review applied | 2017
Theodore Walter; Philipp Kurpiers; Simone Gasparinetti; Paul Magnard; Anton Potočnik; Yves Salathe; Marek Pechal; Mintu Mondal; Markus Oppliger; C. Eichler; A. Wallraff
The speed of quantum gates and measurements is a decisive factor for the overall fidelity of quantum protocols when performed on physical qubits with finite coherence time. Reducing the time required to distinguish qubit states with high fidelity is therefore a critical goal in quantum information science. The state-of-the-art readout of superconducting qubits is based on the dispersive interaction with a readout resonator. Here, we bring this technique to its current limit and demonstrate how the careful design of system parameters leads to fast and high-fidelity measurements without affecting qubit coherence. We achieve this result by increasing the dispersive interaction strength, by choosing an optimal linewidth of the readout resonator, by employing a Purcell filter, and by utilizing phase-sensitive parametric amplification. In our experiment, we measure 98.25% readout fidelity in only 48 ns, when minimizing read-out time, and 99.2% in 88 ns, when maximizing the fidelity, limited predominantly by the qubit lifetime of 7.6 us. The presented scheme is also expected to be suitable for integration into a multiplexed readout architecture.
Physical Review B | 2010
P. Jeglič; Anton Potočnik; M. Klanjsek; M. Bobnar; M. Jagodic; K. Koch; H. Rosner; S. Margadonna; B. Lv; A. M. Guloy; Denis Arčon
We present a detailed study of
Chemical Science | 2014
Anton Potočnik; Alexey Y. Ganin; Yasuhiro Takabayashi; Martin T. McDonald; Ivo Heinmaa; P. Jeglič; Raivo Stern; Matthew J. Rosseinsky; Kosmas Prassides; Denis Arčon
^{75}\text{A}\text{s}
Scientific Reports | 2015
Anton Potočnik; Andraž Krajnc; P. Jeglič; Yasuhiro Takabayashi; Alexey Y. Ganin; Kosmas Prassides; Matthew J. Rosseinsky; Denis Arčon
nuclear magnetic resonance Knight shift and spin-lattice relaxation rate in the normal state of stoichiometric polycrystalline LiFeAs. Our analysis of the Korringa relation suggests that LiFeAs exhibits strong antiferromagnetic fluctuations, if transferred hyperfine coupling is a dominant interaction between