Revealing novel quantum phases in quantum antiferromagnets on random lattices

Quantum magnets represent an ideal playground for the controlled realization of novel quantum phases and of quantum phase transitions. The Hamiltonian of the system can be indeed manipulated by applying a magnetic field or pressure on the sample. When doping the system with non-magnetic impurities...

Повний опис

Збережено в:
Бібліографічні деталі
Дата:2009
Автори: Yu, R., Haas, S., Roscilde, T.
Формат: Стаття
Мова:English
Опубліковано: Інститут фізики конденсованих систем НАН України 2009
Назва видання:Condensed Matter Physics
Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/120289
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати:Revealing novel quantum phases in quantum antiferromagnets on random lattices / R. Yu, S. Haas, T. Roscilde // Condensed Matter Physics. — 2009. — Т. 12, № 3. — С. 519-530. — Бібліогр.: 34 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
Опис
Резюме:Quantum magnets represent an ideal playground for the controlled realization of novel quantum phases and of quantum phase transitions. The Hamiltonian of the system can be indeed manipulated by applying a magnetic field or pressure on the sample. When doping the system with non-magnetic impurities, novel inhomogeneous phases emerge from the interplay between geometric randomness and quantum fluctuations. In this paper we review our recent work on quantum phase transitions and novel quantum phases realized in disordered quantum magnets. The system inhomogeneity is found to strongly affect phase transitions by changing their universality class, giving the transition a novel, quantum percolative nature. Such transitions connect conventionally ordered phases to unconventional, quantum disordered ones quantum Grif ths phases, magnetic Bose glass phases exhibiting gapless spectra associated with low-energy localized excitations.