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Spinons in a crossed-chains model of a 2D spin liquid
Oleg A Starykh1, Rajiv R P Singh, Gregory C Levine
1Department of Physics and Astronomy, Hofstra University, Hempstead, New York 11549, USA.
Physical Review Letters
|April 17, 2002
Summary
We discovered a novel 2D spin-liquid state in frustrated spin-1/2 Heisenberg chains, featuring deconfined spinons. This state exhibits unique properties, including a sliding Luttinger liquid behavior and field-induced order.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
Background:
- Understanding exotic quantum states in low-dimensional magnetic systems is crucial.
- Frustrated spin interactions can lead to non-conventional magnetic ground states.
Purpose of the Study:
- To investigate the ground state and excitations of a 2D model of spin-1/2 Heisenberg chains with frustrated interchain couplings.
- To characterize the behavior of this system under an external magnetic field.
Main Methods:
- Random Phase Approximation (RPA) for theoretical modeling.
- Bosonization techniques for analytical confirmation.
Main Results:
- A nondimerized spin-liquid ground state was identified.
- Deconfined spinons were determined to be the elementary excitations.
- The system was classified as a 'sliding Luttinger liquid'.
- An incommensurate field-induced long-range order with a finite transition temperature was observed in an external field.
Conclusions:
- The frustrated crossed-chains model hosts a stable 2D spin-liquid phase.
- The system exhibits unique quantum phenomena, including deconfined spinons and sliding Luttinger liquid behavior.
- External fields can induce novel ordered phases in this spin-liquid system.