arXiv subjects

K. Zberecki

Publications and source records attributed to K. Zberecki.

14 recordsLinked to original sources

arXiv2026

Binary topological logic gates in Kane-Mele nanostructures via local control of edge-state transport

Topological edge states offer a promising basis for post-CMOS device concepts. However, their use in elementary logic requires simple and physically transparent architectures. Here we study binary logic in Kane-Mele nanostructures with spatially localized control regions. Logical inputs are encoded by local electrostatic, exchange-like, and Rashba-type perturbations. The output is read from terminal transmission within the Landauer-Buttiker framework. We demonstrate working NOT and AND gates in multiterminal honeycomb geometries. Real-space current maps show that their operation is governed by controlled rerouting of edge currents rather than by finely tuned interference. Both gates reproduce the complete truth table in all 50 Anderson-disorder realizations at each tested disorder strength up to W/t=0.1. The NOT gate also remains correctly classified at all 441 points of a two-parameter control scan. Geometric tests confirm stable operation for several patch lengths and branch widths. These results establish Kane-Mele nanostructures as a transparent and numerically robust platform for primitive topological binary logic.

cond-mat.mes-hall↗

arXiv2024

Temperature and excitation energy dependence of Raman scattering in nodal line Dirac semimetal ZrAs_{2}

We present a Raman study of ZrAs_{2} single crystals, a nodal line semimetal with symmetry-enforced Dirac-like band crossings. We identified the symmetry of phonon modes by polarized light measurements and comparison with calculated phonon frequencies. Significant dependence of peak intensities on the excitation wavelength was observed, indicating quantum interference effects. Phonon peaks in the spectra are superimposed on the electronic background, with quasi-elastic scattering observed for the 785 nm excitation. We identified the Fano shape of the 171 cm^{-1} Ag mode due to interference of the phonon state with the electronic continuum. The temperature dependence of phonon peaks linewidth indicates that the electron-phonon coupling plays an essential role in phonon decay.

cond-mat.mtrl-sci↗

arXiv2024

Emergent impervious band crossing in the bulk in topological nodal line semimetal ZrAs$_2$

Topological nodal-line semimetals represent a unique class of materials with intriguing electronic structures and rich of symmetries, hosting electronic states with nontrivial topological properties. Among these, ZrAs$_2$ stands out, characterized by its nodal lines in a momentum space, governed by nonsymmorphic symmetries. This study integrates angle-resolved photoemission spectroscopy (ARPES) with density functional theory (DFT) calculations to explore the electronic states of ZrAs$_2$. Our study provides experimental evidence of nonsymmorphic symmetry-protected band crossing and nodal lines in ZrAs$_2$. In ARPES scans, we observed a distinctive surface and bulk states at different photon energies associated with nodal lines. Our results, supported by calculations based on DFT, unveil such impervious band crossing anchored at specific points in the Brillouin zone, with particular emphasis on the S point. Surface bands and bulk states near the crossing are elucidated through slab calculations, corroborating experimental findings. These findings enhance our understanding of the electronic structure of ZrAs$_2$.

cond-mat.mtrl-sci↗

arXiv2022

Heisenberg models with minimal number of parameters for two-dimensional magnetic crystals

In this work we investigated adequacy of the Heisenberg model application to novel two-dimensional magnetic materials, on an example of monolayer CrI3. We introduced the concept of the mean tensor invariant under symmetry operations of the magnetic structure, which allows the number of parameters of the anisotropic tensor Heisenberg model to be significantly reduced, while maintaining the compliance with the results of ab-initio calculations. We derived the expressions for fourth-order corrections to Heisenberg Hamiltonian and to Dzyaloshinskii-Moriya interaction in the form of quartic symmetry invariants with minimal number of parameters. We tested the physical adequacy of such approach in the case of monolayer CrI3, utilizing an alternative to four-states energy mapping -- the all-parameters least square fit.

cond-mat.mtrl-sci↗

arXiv2020

Magnetic properties of two-dimensional M$_2$N$_3$ (M-metal, N=S,Se,Te) compounds

Using \textit{ab-initio} methods we study structural, electronic and magnetic properties of two dimensional compounds with stoichiometry M$_2$N$_3$ (M-metal, N=S,Se,Te). Our study shows that structures with Cr, Ti, and Mn are stable, with significant binding energy. Also, such structures are semiconductors with narrow band gaps. We also show that Cr$_2$Se$_3$, Cr$_2$Te$_3$ and Mn$_2$Te$_3$ have considerable magnetic moments. The negative values of magnetic anisotropy energy suggest, that these materials can maintain ferromagnetic ordering in non-zero temperatures with estimated Curie temperatures in the range of 30-55 K.

cond-mat.mtrl-sci↗

arXiv2020

Structure prediction of two-dimensional materials based on neural network-driven evolutionary technique

We present a simple yet effective method for structure prediction of two-dimensional structures. The method is based on a combination of neural networks and evolutionary techniques. It allows finding pristine 2D structures as well as structures grown on a substrate. Conducted tests show, that the method is efficient and the calculations, based only on the information of stoichiometry, can lead to stable structures. Since the algorithm is able to address structures on a given substrate, it can be useful from the experimental point of view.

cond-mat.mtrl-sci↗

arXiv2014

Enhanced thermoelectric efficiency in ferromagnetic silicene nanoribbons asymmetrically terminated with hydrogen atoms

Using ab-initio methods we calculate thermoelectric and spin thermoelectric properties of silicene nanoribbons with bare, mono-hydrogenated and di-hydrogenated edges. Asymmetric structures, in which one edge is either bare or di-hydrogenated while the other edge is mono-hydrogenated (0H-1H and 2H-1H nanoribbons) have ferromagnetic ground state and display remarkable conventional and spin thermoelectric properties. Strong enhancement of the thermoelectric efficiency, both conventional and spin ones, results from a very specific band structure of such nanoribbons, where one spin channel is blocked due to an energy gap while the other spin channel is highly conducting. In turn, 0H-2H and 2H-2H nanoribbons (with one edge being either bare or di-hydrogenated and the other edge being di-hydrogenated) are antiferromagnetic in the ground state. Accordingly, the corresponding spin channels are equivalent, and only conventional thermoelectric effects can occur in these nanoribbons.

cond-mat.mtrl-sci↗

arXiv2014

Spin effects in thermoelectric properties of Al and P doped zigzag silicene nanoribbons

Electric and thermoelectric properties of silicene nanoribbons doped with Al and P impurity atoms are investigated theoretically for both antiparallel and parallel orientations of the edge magnetic moments. In the former case, appropriately arranged impurities can lead to a net magnetic moment and thus also to spin thermoelectric effects. In the latter case, in turn, spin thermoelectric effects also occur in the absence of impurities. Numerical results based on ab-initio calculations show that the spin thermopower can be considerably enhanced by the impurities.

cond-mat.mtrl-sci↗

arXiv2013

Thermoelectric effects in silicene nanoribbons

Transport and thermoelectric coefficients (including also spin thermopower) of silicene nanoribbons with zigzag edges are investigated by {\it ab-initio} numerical methods. Local spin density of such nanoribbons reveals edge magnetism. Like in graphene, one finds antiferromagnetic and ferromagnetic ordering, with spin polarization at one edge antiparallel or parallel to that at the other edge, respectively. Thermoelectric properties, especially the Seebeck coefficient, significantly depend on the electronic band structure and are enhanced when the Fermi level is in the energy gap. However, these thermoelectric properties are significantly reduced when the phonon contribution to the heat conductance is included. This phonon contribution has been calculated numerically by two different methods. Transition from antiferromagnetic to ferromagnetic states leads to a large magnetoresistance as well as to a considerable magnetothermopower. Thermoelectric parameters in the antiparallel configuration, when spin polarization in the left part of the nanoribbon is opposite to that in the right part, are also analyzed.

cond-mat.mtrl-sci↗

arXiv2012

Electronic and magnetic properties of two-dimensional Li$_{3}$N

Using first-principles plane-wave calculations study of electronic and magnetic properties of hypothetical two-dimensional structure of Li$_{2}$N compound have been conducted. Calculations show, that electronic properties of this this structure can be inflenced by hydrogenation, which may change the system from wide-gap semiconductor to metal. Also, non-zero magnetic moment, equal to 1 $μ_{B}$ can be generated by intruduction of H vacanies in hydrogenated structure.

cond-mat.mtrl-sci↗

arXiv2011

Magnetism in doped two-dimensional honeycomb structures of III-V binary compounds

Using first-principles plane-wave calculations systematic study of magnetic properties of doped two-dimensional honeycomb structures of III-V binary compounds have been conducted, either for magnetic or nonmagnetic dopants. Calculations show, that all cases where magnetic moment is non-zero are energetically more favorable. For such cases band structure and (partial) density of states were calculated and analyzed in detail. The possible applications of these structures were also discussed.

cond-mat.mes-hall↗

arXiv2006

Tetrahedral correlations in $^{80}$Zr and $^{98}$Zr

Axial octupole and tetrahedral correlations in $^{80}$Zr and $^{98}$Zr have been investigated using the generator coordinate method, applied to a basis generated by Skyrme HF+BCS calculations. We focus on the possible presence of states with tetrahedral symmetry and their stability with respect to octupole vibrations. We show that pairing significantly reduces the stability of the tetrahedral configuration and that a shallow mean-field tetrahedral minimum coexists with an axial octupole minimum. The contributions to the correlation energies coming from the tetrahedral degree of freedom and octupole axial deformation are discussed.

nucl-th↗

arXiv2006

Quantum fluctuations and stability of tetrahedral deformations in atomic nuclei

The possible existence of stable axial octupole and tetrahedral deformations is investigated in $^{80}$Zr and $^{98}$Zr. HFBCS calculations with parity projection have been performed for various parametrizations of the Skyrme energy functional. The correlation and excitation energies of negative parity states associated with shape fluctuations have been obtained using the generator coordinate method (GCM). The results indicate that in these nuclei both the axial octupole and tetrahedral deformations are of dynamic character and possess similar characteristics. Various Skyrme forces give consistent results as a function of these two octupole degrees of freedom both at the mean-field level as well as for configuration mixing calculations.

nucl-th↗

arXiv2005

Hartree-Fock-Bogolyubov calculations for nuclei with tetrahedral deformation

Hartree-Fock-Bogolyubov solutions corresponding to the tetrahedral deformation are found in six tetrahedrally doubly-magic nuclei. Values of the beta32 deformation, depths of the tetrahedral minima, and their energies relative to the co-existing quadrupole minima are determined for several versions of the Skyrme force. Reduction of the tetrahedral deformation energies by pairing correlations is quantitatively analysed. In light nuclei, shallow tetrahedral minima are found to be the lowest in energy, while in heavy nuclei, the minima are deeper but appear at a few MeV of excitation.

nucl-th↗