Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Magnetic quantum phase transitions induced by magnetic field, pressure and impurities in gapped spin systems

真士 藤澤

Published Jan 1, 2006• 0 citations
OpenAlex

Related papers

Experimental study of pressure- and field-induced quantum phase transitions in clean and disordered quantum magnets

Gérard Sylvester Perren

•Jan 1, 2018•1 citation

Field and Impurity Induced Ordering in Interacting Dimer Systems (Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)

Hans-Jürgen Mikeska, Alexei K. Kolezhuk

Progress of Theoretical Physics•Jan 1, 2005•0 citations

Quantum Phase Transitions in Models of Magnetic Impurities

R. Bulla, Matthias Vojta C

Springer eBooks•Jan 1, 2003•6 citations

Entanglement signatures of the quantum phase transition induced by a magnetic impurity in a superconductor

Pedro D Sacramento, P. Nogueira, Vitor Rocha Vieira +1 more

The insertion of a magnetic impurity in a superconductor induces a first order quantum phase transition as the coupling to the electronic spin density increases. As the transition is crossed, a discontinuity is exhibited by various quantities, such as the total spin density, the total gap function, and the gap function at the impurity location. The location of other quantum phase transitions have been detected by singularities in entanglement measures of the system. In this work we show that the single-site and two-site von Neumann entropies, the mutual information, and the Meyer-Wallach measure show discontinuities at the quantum phase transition. The negativity is less sensitive to the transition. We study in detail these quantities as a function of spin coupling and distance from the impurity center.

arXiv:0706.1476•Physical Review B•Nov 20, 2007•15 citations

Impurity-Induced Phase Transitions in Quasi-One-Dimensional Quantum Magnets

Munehisa Matsumoto, Hajime Takayama

In spin‐gapped quasi‐one‐dimensional antiferromagnets that do not show phase transitions down to zero temperature, impurities cause phase transitions by inducing local magnetic moments around them between which long‐range correlation is mediated by weak interchain couplings. We investigate the difference between the effects of non‐magnetic impurities and those of spin‐1/2 magnetic ones in the impurity‐induced transition temperatures and the staggered magnetization in the impurity‐induced ordered phase by the quantum Monte Carlo method. We find that the staggered correlation induced by spin‐1/2 impurities grows slower than that done by non‐magnetic ones as the system is cooled and approaches the ground state, while the transition temperature induced by the former is higher than that done by the latter. We argue that this is one of the characteristic aspects of the order‐by‐disorder phenomena in quantum systems.

AIP conference proceedings•Jan 1, 2006•0 citations

Quantum phase transitions in magnetic systems

Omid Nohadani

•Jan 1, 2014•0 citations
The insertion of a magnetic impurity in a superconductor induces a first order quantum phase transition as the coupling to the electronic spin density increases. As the transition is crossed, a discontinuity is exhibited by various quantities, such as the total spin density, the total gap function, and the gap function at the impurity location. The location of other quantum phase transitions have been detected by singularities in entanglement measures of the system. In this work we show that the single-site and two-site von Neumann entropies, the mutual information, and the Meyer-Wallach measure show discontinuities at the quantum phase transition. The negativity is less sensitive to the transition. We study in detail these quantities as a function of spin coupling and distance from the impurity center.
In spin‐gapped quasi‐one‐dimensional antiferromagnets that do not show phase transitions down to zero temperature, impurities cause phase transitions by inducing local magnetic moments around them between which long‐range correlation is mediated by weak interchain couplings. We investigate the difference between the effects of non‐magnetic impurities and those of spin‐1/2 magnetic ones in the impurity‐induced transition temperatures and the staggered magnetization in the impurity‐induced ordered phase by the quantum Monte Carlo method. We find that the staggered correlation induced by spin‐1/2 impurities grows slower than that done by non‐magnetic ones as the system is cooled and approaches the ground state, while the transition temperature induced by the former is higher than that done by the latter. We argue that this is one of the characteristic aspects of the order‐by‐disorder phenomena in quantum systems.