{
  "id": "1406.6801",
  "version": "v2",
  "published": "2014-06-26T08:20:27.000Z",
  "updated": "2014-11-03T14:45:25.000Z",
  "title": "Gate-controlled supercurrent reversal in MoS$_2$-based Josephson junctions",
  "authors": [
    "Babak Zare Rameshti",
    "Ali G. Moghaddam",
    "Malek Zareyan"
  ],
  "comment": "5 pages, 3 figures",
  "journal": "EPL, 108 (2014) 37002",
  "doi": "10.1209/0295-5075/108/37002",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.supr-con"
  ],
  "abstract": "Motivated by recent experiments revealing superconductivity in MoS$_2$, we investigate the Josephson effect in the monolayer MoS$_2$ at the presence of an exchange splitting. We show that the supercurrent reversal known as $0-\\pi$ transition can occur by varying the doping via gate voltages. This is in contrast to common superconductor/ferromagnet/superconductor junctions in which successive $0-\\pi$ transition take place with the variation of junction length or temperature. In fact for the case of MoS$_2$ we find that both the amplitude and the period of oscillations show a dependence on the doping which explains the predicted doping induced supercurrent reversal. These effects comes from the dependence of density and Fermi velocity on the doping strength beside the intrinsic spin splitting in the valence band which originates from spin-orbit interaction.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-06-26T08:20:27.000Z",
      "title": "Josephson coupling and supercurrent reversal in monolayer MoS$_2$",
      "abstract": "We investigate the Josephson effect in the monolayer MoS$_2$ junctions by varying the doping and spin splitting imposed by ferromagnetic proximity for instance. It is shown that while the critical supercurrent vanishes when the Fermi level lies inside the gap, it reaches a finite value for both $n$ and $p$ type dopings. Moreover, the intrinsic spin splitting in the valence band originating from spin-orbit interaction beside the slightly different effective masses of conduction and valence bands, leads to electron-hole asymmetry in the Josephson current. When we apply the external spin splitting of Zeeman type, an oscillatory behavior for the critical current with length of the junction is observed as a signature of successive $0-\\pi$ transitions in a similar way to the conventional ferromagnetic Josephson junctions. In this case both the amplitude and the period of oscillations show a dependence on the doping originating from the changes in the Fermi velocity. Finally we study the temperature dependence of critical current and a temperature induced $0-\\pi$ transition is found in the monolayer MoS$_2$ Josephson junctions.",
      "comment": "7 pages, 6 figures",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2014-11-03T14:45:25.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "monolayer mos",
      "supercurrent reversal",
      "josephson coupling",
      "fermi level lies inside",
      "spin splitting"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "EPL (Europhysics Letters)",
      "year": 2014,
      "month": "Nov",
      "volume": 108,
      "number": 3,
      "pages": 37002
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014EL....10837002Z"
    }
  }
}