{
  "id": "cond-mat/0509395",
  "version": "v2",
  "published": "2005-09-15T06:56:54.000Z",
  "updated": "2005-09-16T03:14:16.000Z",
  "title": "Spin relaxation and decoherence of two-level systems",
  "authors": [
    "X. R. Wang",
    "Y. S. Zheng",
    "Sun Yin"
  ],
  "comment": "5 pages, 2 figures",
  "journal": "Phys. Rev. B, 72, 121303(R) (2005)",
  "doi": "10.1103/PhysRevB.72.121303",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We revisit the concepts of spin relaxation and spin decoherence of two level (spin-1/2) systems. From two toy-models, we clarify two issues related to the spin relaxation and decoherence: 1) For an ensemble of two-level particles each subjected to a different environmental field, there exists an ensemble relaxation time $T_1^*$ which is fundamentally different from $T_1$. When the off-diagonal coupling of each particle is in a single mode with the same frequency but a random coupling strength, we show that $T_1^*$ is finite while the spin relaxation time of a single spin $T_1$ and the usual ensemble decoherence time $T_2^*$ are infinite. 2) For a two-level particle under only a random diagonal coupling, its relaxation time $T_1$ shall be infinite but its decoherence time $T_2$ is finite.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2005-09-16T03:14:16.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "two-level systems",
      "two-level particle",
      "usual ensemble decoherence time",
      "spin relaxation time",
      "random diagonal"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}