{
  "abstract": "Polar materials have recently attracted significant interest due to their rich multifunctional properties. The chalcogenide polar semiconductor Cu1-xMn1+ySiTe3 (Cu-deficient) is an emerging multiferroic system in which electric polarization is coupled to magnetization. However, its macroscopic ferroelectric polarization is strongly suppressed due to the presence of a high density of stacking faults. In this work, we demonstrate that these crystal defects, likely originating from non-stoichiometry, can be substantially reduced by increasing the Cu content. Cu-enriched samples, Cu1+xMn1-ySiTe3, crystallize in a noncentrosymmetric monoclinic structure (space group Pm) as the Cu-deficient counterpart but show a nearly stacking-fault-free phase, which is attributed to the emergence of an interstitial site. Consequently, the Cu-enriched samples show a pronounced enhancement of the second-harmonic generation (SHG) response compared to Cu-deficient compositions. Magnetically, the Cu-enriched crystals retain long-range antiferromagnetic order with a Neel temperature of TN ~ 33 K without a glassy state but manifest a distinct spin-flop transition along the polar b-axis that is absent in the Cu-deficient compositions. Furthermore, the electronic ground state evolves from insulating to doped semiconducting behavior upon Cu enrichment. Together, these results establish this material system as a unique and versatile platform for elucidating the interplay among composition, crystal defects, and multifunctional properties, offering a route to design magnetic polar systems with tunable quantum functionalities.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. Materials 10, 104415, (2026)",
  "arxiv": "2605.18584",
  "author_total": 18,
  "authors": [
    {
      "name": "Subrata Ghosh"
    },
    {
      "name": "Yu Liu"
    },
    {
      "name": "Saugata Sarker"
    },
    {
      "name": "Boyang Zheng"
    },
    {
      "name": "Sreekant Anil"
    },
    {
      "name": "Soumi Mondal"
    },
    {
      "name": "Yuxi Zhang"
    },
    {
      "name": "Sai Venkata Gayathri Ayyagari"
    },
    {
      "name": "Mingyu Xu"
    },
    {
      "name": "Yingdong Guan"
    },
    {
      "name": "Tsung-Han Yang"
    },
    {
      "name": "Xiaoping Wang"
    },
    {
      "name": "Vincent H. Crespi"
    },
    {
      "name": "Nasim Alem"
    },
    {
      "name": "Weiwei Xie"
    },
    {
      "name": "Venkatraman Gopalan"
    },
    {
      "name": "Qiang Zhang"
    },
    {
      "name": "Zhiqiang Mao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/91we62g200b5k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.18584",
  "fulltext_url": null,
  "id": "91we62g200b5k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.18584",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.18584",
  "pmcid": null,
  "pmid": null,
  "published": "2026-05-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/91we62g200b5k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:18Z",
      "native_id": "2605.18584",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.18584"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Defect Control via Cu Enrichment Enhances Multifunctional Properties in the Polar Semiconductor Cu1+xMn1-ySiTe3",
  "title_text": "Defect Control via Cu Enrichment Enhances Multifunctional Properties in the Polar Semiconductor Cu1+xMn1-ySiTe3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:18Z",
  "url": "https://research.draconitic.com/paper/91we62g200b5k",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/bjx1-dp34",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}