29 citations · 125 across the 10 of their papers we have counts for
10 papers
Finite temperature electric field induced two-dimensional coherent nonlinear spectroscopy in a Kitaev magnet
Wolfram Brenig, Olesia Krupnitska
We study electric field induced two-dimensional coherent nonlinear optical spectroscopy (2DCS) in a Kitaev magnet at finite temperature. We show that 2DCS is susceptible to both ty…
Finite temperature second harmonic generation in Kitaev magnets
Olesia Krupnitska, Wolfram Brenig
We study electric field induced second harmonic generation (2HG) in the Kitaev model. This frustrated magnet hosts a quantum spin-liquid, featuring fractionalization in terms of mo…
On the failure of effective-field theory in predicting a spurious spontaneous ordering and phase transition of Ising nanoparticles, nanoislands, nanotubes and nanowires
Jozef Strecka, Katarina Karlova, Olesia Krupnitska
The present work clarifies a failure of the effective-field theory in predicting a false spontaneous long-range order and phase transition of Ising nanoparticles, nanoislands, nano…
Frustrated quantum Heisenberg double-tetrahedral and octahedral chains at high magnetic fields
Olesia Krupnitska
We consider the spin-1/2 antiferromagnetic Heisenberg model on two one-dimensional frustrated lattices, double-tetrahedral chain and octahedral chain, with almost dispersionless (f…
Thermodynamic properties of BaCoSiOCl in strong magnetic field: Realization of flat-band physics in a highly frustrated quantum magnet
Johannes Richter, Olesia Krupnitska, Vasyl Baliha +2
The search for flat-band solid-state realizations is a crucial issue to verify or to challenge theoretical predictions for quantum many-body flat-band systems. For frustrated quant…
Effective low-energy description of almost Ising-Heisenberg diamond chain
Oleg Derzhko, Olesia Krupnitska, Bohdan Lisnyi +1
We consider a geometrically frustrated spin-1/2 Ising-Heisenberg diamond chain, which is an exactly solvable model when assuming part of the exchange interactions as Heisenberg one…
Frustrated diamond-chain quantum Heisenberg antiferromagnet in a magnetic field
Johannes Richter, Olesia Krupnitska, Taras Krokhmalskii +1
We consider the antiferromagnetic spin-1/2 Heisenberg model on a frustrated diamond-chain lattice in a - or -aligned external magnetic field. We use the strong-coupling…
The square-kagome quantum Heisenberg antiferromagnet at high magnetic fields: The localized-magnon paradigm and beyond
Oleg Derzhko, Johannes Richter, Olesia Krupnitska +1
We consider the spin-1/2 antiferromagnetic Heisenberg model on the two-dimensional square-kagome lattice with almost dispersionless lowest magnon band. For a general exchange coupl…
Frustrated quantum Heisenberg antiferromagnets at high magnetic fields: Beyond the flat-band scenario
Oleg Derzhko, Johannes Richter, Olesia Krupnitska +1
We consider the spin-1/2 antiferromagnetic Heisenberg model on three frustrated lattices (the diamond chain, the dimer-plaquette chain and the two-dimensional square-kagome lattice…
Semiquantitative theory for high-field low-temperature properties of a distorted diamond spin chain
Oleg Derzhko, Johannes Richter, Olesia Krupnitska
We consider the antiferromagnetic Heisenberg model on a distorted diamond chain and use the localized-magnon picture adapted to a distorted geometry to discuss some of its high-fie…