Quantum melting of incommensurate domain walls in two dimensions

Article

关键词: RARE-GAS MONOLAYERS;    PHASE-TRANSITIONS;    MAGNETIZATION PLATEAUS;    STERIC INTERACTION;    DENSITY-WAVE;    FIELD-THEORY;    X-RAY;    GRAPHITE;    SYSTEMS;    SUPERCONDUCTORS;   

DOI  :  10.1103/PhysRevB.67.014529

来源: SCIE

【 摘 要 】

Quantum fluctuations of periodic domain-wall arrays in two-dimensional incommensurate states at zero temperature are investigated using the elastic theory in the vicinity of the commensurate-incommensurate transition point. Both stripe and honeycomb structures of domain walls with short-range interactions are considered. It is revealed that the stripes melt and become a stripe liquid in a large-wall-spacing (low-density) region due to dislocations created by quantum fluctuations. This quantum melting transition is of second order and characterized by the three-dimensional XY universality class. Zero-point energies of the stripe and honeycomb structures are calculated. As a consequence of these results, phase diagrams of the domain-wall solid and liquid phases in adsorbed atoms on graphite are discussed for various domain-wall masses. Quantum melting of stripes in the presence of long-range interactions that fall off as power laws is also studied. These results are applied to incommensurate domain walls in two-dimensional adsorbed atoms on substrates and in doped antiferromagnets, e.g., cuprates and nickelates.

【 授权许可】

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