1999/06/17 by Leon Balents, Chandra M. Varma, C. M. Varma +2
Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Semiconductor Quantum Structures and Devices #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/9906259
4 pages
arxiv created 1999/06/17 · openalex publication_date 1999/06/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The theory of doped excitonic insulators is reinvestigated in light of recent experiments on hexaborides. For the appropriate valley-degenerate X3,X3' band structure, ``intra-valley'' condensation is energetically favored. Ferromagnetism occurs upon doping due to the quenching of kinetic energy at the otherwise direct first-order excitonic insulator-metal transition. The phase diagram includes states of spatially inhomogeneous density and magnetization at low temperatures.