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most citedDMRG Study of Critical Behavior of the Spin-1/2 Alternating Heisenberg Chain

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cond-mat.mtrl-sci2005

Two-electron F' centers in alkali halides: A negative-U analysis

Mladen Georgiev

The existence of bound excited states of two-electron centers loosely trapped in an anion vacancy, the F' centers, is a long-standing problem of color center physics. Optical absor…