168 citations · 2.1k across the 57 of their papers we have counts for
44 papers · 1 filter
symmetry breaking in quantum antiferromagnets
A. K. Kolezhuk, T. L. Zavertanyi
We study a -symmetric spin- system on a bipartite lattice close to the antiferromagnetic -symmetric point, which can be described by the model with…
Stabilization of magnetic skyrmions by RKKY interactions
Alla V. Bezvershenko, Alexei K. Kolezhuk, Boris A. Ivanov
We study the stabilization of an isolated magnetic skyrmion in a magnetic monolayer on a nonmagnetic conducting substrate via the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange inte…
Finite-size nanowire at a surface: unconventional power laws of the van der Waals interaction
K. A. Makhnovets, A. K. Kolezhuk
We study the van der Waals interaction of a metallic or narrow-gap semiconducting nanowire with a surface, in the regime of intermediate wire-surface distances $(v_{F}/c)L \ll d \l…
Unconventional spin dynamics in the honeycomb-lattice material -RuCl: high-field ESR studies
A. N. Ponomaryov, E. Schulze, J. Wosnitza +8
We present high-field electron spin resonance (ESR) studies of the honeycomb-lattice material -RuCl, a prime candidate to exhibit Kitaev physics. Two modes of antiferromagne…
Fidelity at Berezinskii-Kosterlitz-Thouless quantum phase transitions
G. Sun, A. K. Kolezhuk, T. Vekua
We clarify the long-standing controversy concerning the behavior of the ground state fidelity in the vicinity of a quantum phase transition of the Berezinskii-Kosterlitz-Thouless t…
Ferromagnetic spin-orbital liquid of dipolar fermions in zigzag lattices
G. Sun, A. K. Kolezhuk, L. Santos +1
Two-component dipolar fermions in zigzag optical lattices allow for the engineering of spin-orbital models. We show that dipolar lattice fermions permit the exploration of a regime…
Current fidelity susceptibility and conductivity in one-dimensional lattice models with open and periodic boundary conditions
S. Greschner, A. K. Kolezhuk, T. Vekua
We study, both numerically and analytically, the finite size scaling of the fidelity susceptibility χ_{J} with respect to the charge or spin current in one-dimensional lattice mode…
Double zigzag spin chain in strong magnetic field close to saturation
I. T. Shyiko, I. P. McCulloch, J. V. Gumenjuk-Sichevska +1
We study the ground state phase diagram of a frustrated spin tube in a strong external magnetic field. This model can be viewed as two coupled zigzag spin chains, or as a two-leg s…
Dynamics and relaxation in spin nematics
V. G. Bar'yakhtar, V. I. Butrim, A. K. Kolezhuk +1
We study dynamics and relaxation of elementary excitations (magnons) in the spin nematic (quadrupole ordered) phase of S=1 magnets. We develop a general phenomenological theory of…
Frustrated spin chains in strong magnetic field: dilute two-component Bose gas regime
A. K. Kolezhuk, F. Heidrich-Meisner, S. Greschner +1
We study the ground state of frustrated spin-S chains in a strong magnetic field in the immediate vicinity of saturation. In strongly frustrated chains, the magnon dispersion has t…
Phase diagram of an anisotropic frustrated ferromagnetic spin-1/2 chain in a magnetic field: a density matrix renormalization group study
F. Heidrich-Meisner, I. P. McCulloch, A. K. Kolezhuk
We study the phase diagram of a frustrated spin-1/2 ferromagnetic chain with anisotropic exchange interactions in an external magnetic field, using the density matrix renormalizati…
Field-controlled spin current in frustrated spin chains
A. K. Kolezhuk, I. P. McCulloch
We study states with spontaneous spin current, emerging in frustrated antiferromagnetic spin- chains subject to a strong external magnetic field. As a numerical tool, we use a n…
Symmetry breaking in low-dimensional SU(N) antiferromagnets
Alexei Kolezhuk
Consequences of explicit symmetry breaking in a physically motivated model of SU(N) antiferromagnet in spatial dimensions one and two are studied. It is shown that the case N=3, wh…
Spin Dynamics of in the Field-Induced Ordered Phase
S. A. Zvyagin, J. Wosnitza, A. K. Kolezhuk +6
- (known as DTN) is a spin-1 material with a strong single-ion anisotropy that is regarded as a new candidate for Bose-Einstein condensation (BEC) of spin deg…
Vector chiral order in frustrated spin chains
I. P. McCulloch, R. Kube, M. Kurz +3
By means of a numerical analysis using a non-Abelian symmetry realization of the density matrix renormalization group, we study the behavior of vector chirality correlations in iso…
Pairing of Solitons in Two-Dimensional S=1 Magnets
B. A. Ivanov, R. S. Khymyn, A. K. Kolezhuk
We discuss the structure of topological solitons in a general non-Heisenberg model of isotropic two-dimensional magnet with spin S=1, in the vicinity of a special point where the m…
Hole dynamics in an antiferromagnet across a deconfined quantum critical point
Ribhu K. Kaul, Alexei Kolezhuk, Michael Levin +2
We study the effects of a small density of holes, delta, on a square lattice antiferromagnet undergoing a continuous transition from a Neel state to a valence bond solid at a decon…
Edge singularities in high-energy spectra of gapped one-dimensional magnets in strong magnetic fields
A. Friedrich, A. K. Kolezhuk, I. P. McCulloch +1
We use the dynamical density matrix renormalization group technique to show that the high-energy part of the spectrum of a S=1 Haldane chain, placed in a strong external magnetic f…
Fermi surface change across a deconfined quantum critical point
Ribhu K. Kaul, Alexei Kolezhuk, Michael Levin +2
The quantum phase transitions of metals have been extensively studied in the rare-earth "heavy electron" materials, the cuprates, and related compounds. The Fermi surface of the me…
Theory of quantum impurities in spin liquids
Alexei Kolezhuk, Subir Sachdev, Rudro R. Biswas +1
We describe spin correlations in the vicinity of a generalized impurity in a wide class of fractionalized spin liquid states. We argue that the primary characterization of the impu…
Magnon decay in gapped quantum spin systems
Alexei Kolezhuk, Subir Sachdev
In the O(3) sigma-model description of gapped spin systems, S=1 magnons can only decay into three lower energy magnons. We argue that the symmetry of the quantum spin Hamiltonian o…
Field-induced chiral phase in isotropic frustrated spin chains
Alexei Kolezhuk, Temo Vekua
It is shown that an external magnetic field applied to a spin-S isotropic zigzag chain induces a phase with spontaneously broken parity, characterized by long range ordering of vec…
Electron Spin Resonance in sine-Gordon spin chains in the perturbative spinon regime
S. A. Zvyagin, A. K. Kolezhuk, J. Krzystek +1
We report the low-temperature multi-frequency ESR studies of copper pyrimidine dinitrate, a spin-1/2 antiferromagnetic chain with alternating -tensor and the Dzyaloshinskii-Mori…
One-Dimensional Magnetism
H. -J. Mikeska, A. K. Kolezhuk
This paper has been withdrawn.