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  1. Artikel ; Online: Non-equilibrium quantum domain reconfiguration dynamics in a two-dimensional electronic crystal and a quantum annealer.

    Vodeb, Jaka / Diego, Michele / Vaskivskyi, Yevhenii / Logaric, Leonard / Gerasimenko, Yaroslav / Kabanov, Viktor / Lipovsek, Benjamin / Topic, Marko / Mihailovic, Dragan

    Nature communications

    2024  Band 15, Heft 1, Seite(n) 4836

    Abstract: Relaxation dynamics of complex many-body quantum systems trapped into metastable states is a very active field of research from both the theoretical and experimental point of view with implications in a wide array of topics from macroscopic quantum ... ...

    Abstract Relaxation dynamics of complex many-body quantum systems trapped into metastable states is a very active field of research from both the theoretical and experimental point of view with implications in a wide array of topics from macroscopic quantum tunnelling and nucleosynthesis to non-equilibrium superconductivity and energy-efficient memory devices. In this work, we investigate quantum domain reconfiguration dynamics in the electronic superlattice of a quantum material using time-resolved scanning tunneling microscopy and unveil a crossover from temperature to noisy quantum fluctuation dominated dynamics. The process is modeled using a programmable superconducting quantum annealer in which qubit interconnections correspond directly to the microscopic interactions between electrons in the quantum material. Crucially, the dynamics of both the experiment and quantum simulation is driven by spectrally similar pink noise. We find that the simulations reproduce the emergent time evolution and temperature dependence of the experimentally observed electronic domain dynamics.
    Sprache Englisch
    Erscheinungsdatum 2024-06-06
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-49179-z
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Buch ; Online: Unconventional photo-induced charge-density-wave dynamics in 2H-NbSe$_{2}$

    Venturini, Rok / Sarkar, Ankita / Sutar, Petra / Jagličić, Zvonko / Vaskivskyi, Yevhenii / Goreshnik, Evgeny / Mihailovic, Dragan / Mertelj, Tomaz

    2023  

    Abstract: We investigated temperature ($T$) dependent ultrafast near-infrared (NIR) transient reflectivity dynamics in coexisting superconducting (SC) and charge density wave (CDW) phases of two-dimensional 2H-NbSe$_{2}$ using NIR and visible excitations. With ... ...

    Abstract We investigated temperature ($T$) dependent ultrafast near-infrared (NIR) transient reflectivity dynamics in coexisting superconducting (SC) and charge density wave (CDW) phases of two-dimensional 2H-NbSe$_{2}$ using NIR and visible excitations. With visible pump-photon excitation (400 nm) we find a slow high-energy quasiparticle relaxation channel which is present in all phases. In the CDW phase, we observe a distinctive transient response component, irrespective of the pump-photon energy. The component is marked by the absence of coherent amplitude mode oscillations and a relatively slow, picosecond rise time, which is different than in most of the typical CDW materials. In the SC phase, another tiny component emerges that is associated with optical suppression of the SC phase. The transient reflectivity relaxation in the CDW phase is dominated by phonon diffusive processes with an estimated low-$T$ heat diffusion constant anisotropy of $\sim30$. Strong excitation of the CDW phase reveals a weakly non-thermal CDW order parameter (OP) suppression. Unlike CDW systems with a larger gap, where the optical OP suppression involves only a small fraction of phonon degrees of freedom, the OP suppression in 2H-NbSe$_{2}$ is characterised by the excitation of a large amount of phonon degrees of freedom and significantly slower dynamics.
    Schlagwörter Condensed Matter - Superconductivity ; Condensed Matter - Materials Science
    Thema/Rubrik (Code) 535
    Erscheinungsdatum 2023-09-05
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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  3. Artikel ; Online: Manipulation of fractionalized charge in the metastable topologically entangled state of a doped Wigner crystal.

    Mraz, Anze / Diego, Michele / Kranjec, Andrej / Vodeb, Jaka / Karpov, Peter / Gerasimenko, Yaroslav / Ravnik, Jan / Vaskivskyi, Yevhenii / Venturini, Rok / Kabanov, Viktor / Lipovšek, Benjamin / Topič, Marko / Vaskivskyi, Igor / Mihailovic, Dragan

    Nature communications

    2023  Band 14, Heft 1, Seite(n) 8214

    Abstract: Metastability of many-body quantum states is rare and still poorly understood. An exceptional example is the low-temperature metallic state of the layered dichalcogenide 1T- ... ...

    Abstract Metastability of many-body quantum states is rare and still poorly understood. An exceptional example is the low-temperature metallic state of the layered dichalcogenide 1T-TaS
    Sprache Englisch
    Erscheinungsdatum 2023-12-11
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-43800-3
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Quantum billiards with correlated electrons confined in triangular transition metal dichalcogenide monolayer nanostructures.

    Ravnik, Jan / Vaskivskyi, Yevhenii / Vodeb, Jaka / Aupič, Polona / Vaskivskyi, Igor / Golež, Denis / Gerasimenko, Yaroslav / Kabanov, Viktor / Mihailovic, Dragan

    Nature communications

    2021  Band 12, Heft 1, Seite(n) 3793

    Abstract: Forcing systems through fast non-equilibrium phase transitions offers the opportunity to study new states of quantum matter that self-assemble in their wake. Here we study the quantum interference effects of correlated electrons confined in monolayer ... ...

    Abstract Forcing systems through fast non-equilibrium phase transitions offers the opportunity to study new states of quantum matter that self-assemble in their wake. Here we study the quantum interference effects of correlated electrons confined in monolayer quantum nanostructures, created by femtosecond laser-induced quench through a first-order polytype structural transition in a layered transition-metal dichalcogenide material. Scanning tunnelling microscopy of the electrons confined within equilateral triangles, whose dimensions are a few crystal unit cells on the side, reveals that the trajectories are strongly modified from free-electron states both by electronic correlations and confinement. Comparison of experiments with theoretical predictions of strongly correlated electron behaviour reveals that the confining geometry destabilizes the Wigner/Mott crystal ground state, resulting in mixed itinerant and correlation-localized states intertwined on a length scale of 1 nm. The work opens the path toward understanding the quantum transport of electrons confined in atomic-scale monolayer structures based on correlated-electron-materials.
    Sprache Englisch
    Erscheinungsdatum 2021-06-18
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-24073-0
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: A time-domain phase diagram of metastable states in a charge ordered quantum material.

    Ravnik, Jan / Diego, Michele / Gerasimenko, Yaroslav / Vaskivskyi, Yevhenii / Vaskivskyi, Igor / Mertelj, Tomaz / Vodeb, Jaka / Mihailovic, Dragan

    Nature communications

    2021  Band 12, Heft 1, Seite(n) 2323

    Abstract: Metastable self-organized electronic states in quantum materials are of fundamental importance, displaying emergent dynamical properties that may be used in new generations of sensors and memory devices. Such states are typically formed through phase ... ...

    Abstract Metastable self-organized electronic states in quantum materials are of fundamental importance, displaying emergent dynamical properties that may be used in new generations of sensors and memory devices. Such states are typically formed through phase transitions under non-equilibrium conditions and the final state is reached through processes that span a large range of timescales. Conventionally, phase diagrams of materials are thought of as static, without temporal evolution. However, many functional properties of materials arise as a result of complex temporal changes in the material occurring on different timescales. Hitherto, such properties were not considered within the context of a temporally-evolving phase diagram, even though, under non-equilibrium conditions, different phases typically evolve on different timescales. Here, by using time-resolved optical techniques and femtosecond-pulse-excited scanning tunneling microscopy (STM), we track the evolution of the metastable states in a material that has been of wide recent interest, the quasi-two-dimensional dichalcogenide 1T-TaS
    Sprache Englisch
    Erscheinungsdatum 2021-04-19
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-22646-7
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel ; Online: NMR, Raman, and DFT Study of Lyotropic Chromonic Liquid Crystals of Biomedical Interest: Tautomeric Equilibrium and Slow Self-Assembling in Sunset Yellow Aqueous Solutions.

    Kristinaitytė, Kristina / Maršalka, Aru Nas / Dagys, Laurynas / Aidas, Kęstutis / Doroshenko, Iryna / Vaskivskyi, Yevhenii / Chernolevska, Yelyzaveta / Pogorelov, Valeriy / Valevičienė, Nomeda Rima / Balevicius, Vytautas

    The journal of physical chemistry. B

    2018  Band 122, Heft 12, Seite(n) 3047–3055

    Abstract: Temperature and composition effects in Sunset Yellow FCF (SSY) aqueous solutions were studied by ... ...

    Abstract Temperature and composition effects in Sunset Yellow FCF (SSY) aqueous solutions were studied by the
    Sprache Englisch
    Erscheinungsdatum 2018--29
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1520-5207
    ISSN (online) 1520-5207
    DOI 10.1021/acs.jpcb.8b00350
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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