A5082100655- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Condensed Matter Physics
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Topological Materials and Phenomena
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Atomic and Subatomic Physics Research
- Iron-based superconductors research
- Magnetic properties of thin films
- Superconductivity in MgB2 and Alloys
- Strong Light-Matter Interactions
- Semiconductor Quantum Structures and Devices
- Advanced Chemical Physics Studies
- Rare-earth and actinide compounds
- Organic and Molecular Conductors Research
- Mechanical and Optical Resonators
- Semiconductor materials and devices
- Quantum Information and Cryptography
- Theoretical and Computational Physics
- Graphene research and applications
- Surface and Thin Film Phenomena
- Molecular Junctions and Nanostructures
University of Salerno
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2020-2025
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Salerno
2020-2025
Superconducting and other Innovative Materials and Devices Institute
2010-2025
Istituto Nazionale di Fisica Nucleare
2010-2024
University of Naples Federico II
2019
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2018
International Institute for Advanced Scientific Studies "Eduardo R. Caianiello"
2007-2018
IRCCS San Camillo Hospital
2011
National Interuniversity Consortium for the Physical Sciences of Matter
2006-2009
We review the physics of one-dimensional interacting bosonic systems. Beginning with results from exactly solvable models and computational approaches, we introduce concept Tomonaga-Luttinger Liquids relevant for one-dimension, compare it Bose-Einstein condensates existing in dimensions higher than one. discuss effects various perturbations on liquid state as well extensions to multicomponent out equilibrium situations. Finally, experimental systems that can be described terms bosons one dimension.
Atomtronics deals with matter-wave circuits of ultracold atoms manipulated through magnetic or laser-generated guides different shapes and intensities. In this way, new types quantum networks can be constructed in which coherent fluids are controlled the know-how developed atomic molecular physics community. particular, devices enhanced precision, control, flexibility their operating conditions accessed. Concomitantly, simulators emulators harnessing on current flows also developed. Here,...
We use bosonization, retaining band curvature terms, to analyze the Hall response of interacting bosonic and fermionic two-leg ladders threaded by a flux. derive an explicit expression imbalance in perturbative expansion curvature, fully interactions. show that flux dependence allows distinguish two phases (Meissner vortex) are present for ladder. For small magnetic field we relate resistance, both ladders, density charge stiffness system absence Our unveils universal interaction-independent...
We present a 14N nuclear magnetic resonance study of single crystal CuBr4(C5H12N)2 (BPCB) consisting weakly coupled spin-1/2 Heisenberg antiferromagnetic ladders. Treating ladders in the gapless phase as Luttinger liquids, we are able to fully account for (i) field dependence spin-lattice relaxation rate T1(-1) at 250 mK and (ii) transition 3D ordered occurring below 110 due weak interladder exchange coupling. BPCB is thus an excellent model system where possibility control liquid parameters...
We investigate weakly coupled spin-$1/2$ ladders in a magnetic field. The work is motivated by recent experiments on the compound ${(}_{\mathrm{C}}{\mathrm{H}}_{12}{\mathrm{N}}_{)}{\mathrm{CuBr}}_{4}$ (BPCB). use combination of numerical and analytical methods, particular, density-matrix renormalization group (DMRG) technique, to explore phase diagram excitation spectra such system. give detailed results temperature dependence magnetization specific heat, magnetic-field...
We study Thouless pumping out of the adiabatic limit. Our findings show that despite its topological nature, this phenomenon is not generically robust to nonadiabatic effects. Indeed, we find Floquet diagonal ensemble value pumped charge shows a deviation from topologically quantized limit which quadratic in driving frequency for sudden switch on driving. This reflected also single period, nonanalytic behavior top an overall decrease. Exponentially small corrections are recovered only with...
Neutron diffraction is used to investigate the field-induced, antiferromagnetically ordered state in two-leg spin-ladder material ${(\text{Hpip})}_{2}{\text{CuBr}}_{4}$. This ``classical'' phase, a consequence of weak interladder coupling, nevertheless highly unconventional: its properties are influenced strongly by spin Luttinger-liquid ladder subunits. We determine directly order parameter (transverse magnetization), ordering temperature, structure, and critical exponents around...
A strongly correlated Luttinger-liquid behavior is found to emerge well beyond the Tonks-Girardeau (TG) regime in a one-dimensional Bose gas with dipolar repulsions at $T=0$, persisting for wide range of densities. After combining reptation quantum Monte Carlo and bosonization techniques, we provide unifying theory underlying crossover physics, evolving from TG low density into classical quasiordered state high density. The dependent Luttinger parameters extracted numerical data all that...
We discuss the origin of an additional dip other than charge neutrality point observed in transfer characteristics graphene-based field-effect transistors with a Si/SiO2 substrate used as back-gate. The double is proved to arise from between graphene and metal electrodes, while storage at graphene/SiO2 interface can make it more evident. Considering different Fermi energy along channel partial pinning contacts, we propose model which explains all features gate voltage loops. finally show...
A one-dimensional quantum charge pump transfers a quantized in each pumping cycle. This quantization is topologically robust being analogous to the Hall effect. The transferred fraction of period instead generally unquantized. We show, however, that with specific symmetries parameter space at well-defined fractions as integer Chern number. illustrate this Harper-Hofstadter model and show fractional topological independent boundary conditions taken into account. further discuss relevance...
The phase diagram of a half-filled hard core boson two-leg ladder in flux is investigated by means numerical simulations based on the Density Matrix Renormalization Group (DMRG) algorithm and bosonization. We calculate experimentally accessible observables such as momentum distribution, well rung current, density wave bond-order correlation functions, allowing us to identify Mott Meissner Vortex states. follow transition from commensurate incommensurate state at increasing interchain hopping...
The superconducting diode effect, reminiscent of the unidirectional charge transport in semiconductor diodes, is characterized by a nonreciprocal, dissipationless flow Cooper pairs. This remarkable phenomenon arises from interplay between symmetry constraints and inherent quantum behavior superconductors. Here, we explore geometric control effect kinked nanostrip Josephson junction based on two-dimensional electron gas (2DEGs) with Rashba spin-orbit interaction. We provide comprehensive...
We investigate the effect of Rashba spin-orbit coupling and a tunnel barrier on zero-conductance resonances appearing in one-dimensional conducting Aharonov-Bohm (AB) ring symmetrically coupled to two leads. The transmission function corresponding one-electron problem is derived within scattering matrix approach analyzed complex energy plane with focus role strength zero-pole structure characteristic (anti)resonances. lifting real conductance zeros related breaking spin-reversal symmetry...
We determine the phase diagram and momentum distribution for a one-dimensional Bose gas with repulsive short-range interactions in presence of two-color lattice potential, an incommensurate ratio among respective wavelengths, by using combined numerical (density matrix renormalization group) analytical (bosonization) analysis. The system displays delocalized (superfluid) at small values intensity secondary ${\mathit{V}}_{2}$ localized (Bose-glasslike) larger ${\mathit{V}}_{2}$. analyze...
We investigate the electrical switching of charge and spin transport in a topological insulator nanoconstriction four terminal device. The switch edge channels is caused by coupling between states which overlap constriction tunneling effects at contacts therefore can be manipulated tuning applied voltages on split-gate or geometrical etching. mechanism conveniently studied electron interferometry involving measurements current different configurations side gates, while bias from external...
Pure spin currents are shown to be generated by an electrically controlled quantum pump applied at the edges of a topological insulator. The electric rather than more conventional magnetic control offers several advantages and avoids, in particular, necessity delicate magnetization dynamics over tiny regions. is implemented pinching sample two point contacts phase modulating external gate voltages between them. current for full range parameters. On other hand, pumping via amplitude...
We investigate the response of a one-dimensional Bose gas to slow increase its interaction strength. focus on rich dynamics equal-time single-particle correlations treating Lieb-Liniger model within bosonization approach and Bose-Hubbard using time-dependent density-matrix renormalization group method. For short distances, follow power-law with distance an exponent given by adiabatic approximation. In contrast, for long decay algebraically understood sudden quench This regime is separated...