Title: Dimensionality-Mediated Semimetal-Semiconductor Transition in Ultrathin ${\mathrm{PtTe}}_2$ Films

Abstract

Platinum ditelluride ( ${\mathrm{PtTe}}_2$), a type-II Dirac semimetal, remains semimetallic in ultrathin films down to just two triatomic layers (TLs) with a negative gap of $-0.36\mathrm{eV}$. Additional reduction of the film thickness to a single TL induces a Lifshitz electronic transition to a semiconductor with a large positive gap of $+0.79\mathrm{eV}$. This transition is evidenced by experimental band structure mapping of films prepared by layer-resolved molecular beam epitaxy, and by comparing the data to first-principles calculations using a hybrid functional. The results show a novel electronic transition at the two-dimensional limit through film thickness control.

Authors:

Lin, Meng-Kai ^[1]; Villaos, Rovi Angelo B.  ^[2];

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Hlevyack, Joseph A. ^[1]; Chen, Peng  ^[3];

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Liu, Ro-Ya  ^[4];

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Hsu, Chia-Hsiu ^[2]; Avila, José ^[5]; Mo, Sung-Kwan  ^[6];

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Chuang, Feng-Chuan  ^[2];

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Chiang, T. -C.  ^[1]

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+ Show Author Affiliations

1. Univ. of Illinois at Urbana-Champaign, IL (United States)
2. National Sun Yat-Sen Univ. (Taiwan)
3. Univ. of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Shanghai Jiao Tong Univ. (China)
4. Univ. of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Academia Sinica, Taipei (Taiwan)
5. Univ. Paris-Saclay, Gif-sur-Yvette (France)
6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:

2020-01-24

Research Org.:

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Illinois, Chicago, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

OSTI Identifier:

1603577

Alternate Identifier(s):

OSTI ID: 1598478

Grant/Contract Number:  

AC02-05CH11231; FG02-07ER46383

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review Letters

Additional Journal Information:

Journal Volume: 124; Journal Issue: 3; Journal ID: ISSN 0031-9007

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; Transition metal dichalcogenides, PtTe2, single layer, semimetals, semiconductors, phase transitions