Frozen magnetic states in quasi-two-dimensional Cr1/3−x NixTaS2 compounds with competing exchange interactions

1997 ◽  
Vol 39 (10) ◽  
pp. 1607-1611 ◽  
Author(s):  
G. A. Takzei ◽  
M. V. Gavrilenko ◽  
I. I. Sych ◽  
P. Esquinazi ◽  
L. M. Kulikov
Keyword(s):  
Exchange Interactions ◽  
Two Dimensional ◽  
Magnetic States

scholarly journals Effect of electron correlations on the formation of spiral magnetic states in the two-dimensional t-t′ Hubbard model

JETP Letters ◽  
2013 ◽  
Vol 98 (3) ◽  
pp. 150-155 ◽  
Author(s):  
P. A. Igoshev ◽  
M. A. Timirgazin ◽  
A. K. Arzhnikov ◽  
V. Yu. Irkhin
Keyword(s):  
Hubbard Model ◽  
Two Dimensional ◽  
Electron Correlations ◽  
Magnetic States

Magnetic Phase Transitions in the Two-Dimensional Random Mixture K2CuxCo1-xF4with Competing Exchange Interactions

1990 ◽  
Vol 59 (5) ◽  
pp. 1792-1800 ◽  
Author(s):  
Masayuki Itoh ◽  
Isao Yamada ◽  
Mamoru Ishizuka ◽  
Kiichi Amaya ◽  
Tatsuo Kobayashi ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Magnetic Phase ◽  
Exchange Interactions ◽  
Magnetic Phase Transitions ◽  
Two Dimensional ◽  
Random Mixture

scholarly journals Two-dimensional semiconductors pave the way towards dopant-based quantum computing

2018 ◽  
Vol 9 ◽  
pp. 2668-2673 ◽  
Author(s):  
José Carlos Abadillo-Uriel ◽  
Belita Koiller ◽  
María José Calderón
Keyword(s):  
Conduction Band ◽  
Quantum Computer ◽  
2D Materials ◽  
Exchange Interactions ◽  
Lattice Parameter ◽  
Oscillatory Behavior ◽  
Conduction Band Edge ◽  
Two Dimensional ◽  
Tunnel Coupling ◽  
Qubit Operations

Since the proposal in 1998 to build a quantum computer using dopants in silicon as qubits, much progress has been made in the nanofabrication of semiconductors and the control of charge and spins in single dopants. However, an important problem remains unsolved, namely the control over exchange interactions and tunneling between two donors, which presents a peculiar oscillatory behavior as the dopants relative positions vary at the scale of the lattice parameter. Such behavior is due to the valley degeneracy in the conduction band of silicon, and does not occur when the conduction-band edge is at k = 0. We investigate the possibility of circumventing this problem by using two-dimensional (2D) materials as hosts. Dopants in 2D systems are more tightly bound and potentially easier to position and manipulate. Moreover, many of them present the conduction band minimum at k = 0, thus no exchange or tunnel coupling oscillations. Considering the properties of currently available 2D semiconductor materials, we access the feasibility of such a proposal in terms of quantum manipulability of isolated dopants (for single qubit operations) and dopant pairs (for two-qubit operations). Our results indicate that a wide variety of 2D materials may perform at least as well as, and possibly better, than the currently studied bulk host materials for donor qubits.

scholarly journals Термодинамические и магнитные свойства двумерной анизотропной модели Изинга с конкурирующими взаимодействиями

2019 ◽  
Vol 61 (10) ◽  
pp. 1911
Author(s):  
А.К. Муртазаев ◽  
Ж.Г. Ибаев
Keyword(s):  
Exchange Interactions ◽  
Square Lattice ◽  
Wave Number ◽  
Two Dimensional ◽  
Competing Interactions ◽  
Distinctive Features ◽  
Magnetic Parameters ◽  
Modulated Structures ◽  
Temperature Dependences ◽  
Competing Interaction

The two-dimensional anisotropic Ising model was studied with competing interactions on a square lattice using Monte-Carlo methods using the Wang-Landau algorithm. The temperature dependences of the main thermodynamic and magnetic parameters are calculated. The distinctive features of the temperature dependences of these parameters are shown for different values of the competing interaction. The graphs of the dependence of the wave number of modulated structures on the ratio of the parameters of exchange interactions are plotted. Built phase diagram of the model. Interpolating the phase boundaries of the diagram, the coordinates of the Lifshchits point and phase localization areas with different wave vector values are calculated.

scholarly journals Localized magnetic states in two-dimensional semiconductors

2018 ◽  
Vol 97 (23) ◽  
Author(s):  
A. S. Rodin ◽  
A. H. Castro Neto
Keyword(s):  
Two Dimensional ◽  
Magnetic States

A novel two-dimensional layered Cu2+ complex based on Dawson-like [H3BiW18O60]6−: synthesis, structure and magnetic properties

2018 ◽  
Vol 74 (11) ◽  
pp. 1267-1273
Author(s):  
Shuai He ◽  
Ying Xin ◽  
Jiansheng Li ◽  
Zaiming Zhu ◽  
Peng Zhao ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electrochemical Behaviour ◽  
Exchange Interactions ◽  
Antiferromagnetic Exchange ◽  
Two Dimensional ◽  
Carbon Paste ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dimensional Network ◽  
Paste Electrode

A novel complex based on the Dawson-like [H3BiW18O60]6−, i.e. (C2H9N2)2[{Cu(C10H8N2)(C2H8N2)}2(H3BiW18O60)]·5.5H2O or (enH)2[{Cu(2,2′-bipy)(en)}2(μ4-H3BiW18O60)]·5.5H2O, (1), where enH is protonated ethane-1,2-diamine, 2,2′-bipy is 2,2′-bipyridine and en is ethane-1,2-diamine, has been synthesized hydrothermally and characterized by elemental analysis, single-crystal X-ray diffraction analysis, IR spectroscopy, powder XRD, and thermogravimetry and differential thermal analysis (TG–DTA). For (1), each [H3BiW18O60]6− anion acts as a tetradentate ligand connecting [Cu(2,2′-bipy)(en)]2+ fragments via two terminal and two bridging O atoms, forming a two-dimensional network structure. Along the a and c axes, polyoxometalate units are arranged in an AB…AB manner. The electrochemical behaviour of (1)–CPE (CPE is a carbon paste electrode) was investigated in 2 M H2SO4 solution by cyclic voltammetry (CV). The redox process of WVI/V takes place at E 1/2 = −0.58 (I–I′) and −0.37 V (II–II′), and at −0.04 V (III–III′) for CuII/0. The magnetic properties of (1) were investigated in the range 2–300 K and indicated the existence of strong antiferromagnetic exchange interactions between the Cu2+ centres.

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