Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1811116 | Physica B: Condensed Matter | 2011 | 7 Pages |
Abstract
We analyze the exact ground state of XXZ zigzag spin chain with applied magnetic field and find the quantum critical surface. Using the theorem of positive semi-definite matrix, we can prove that the ground states for a specific region are fully polarized state and one-magnon state. We also argue that this is the quantum critical surface in all cases. Applied to the superconducting quantum dots array, our result gives the analytical expression of quantum critical surface for the system in the presence of gate voltage.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Meihua Chen, Sujit Sarkar, C.D. Hu,