Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

T. Eknapakul; I. Fongkaew; R. Vidyasagar; J.D. Denlinger; Lewis Bawden; S.-K Mo; Philip David King; H. Takagi; S. Limpijumnong; W. Meesvasana

doi:10.1103/PhysRevB.94.201121

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe₂

T. Eknapakul, I. Fongkaew, R. Vidyasagar, J.D. Denlinger, Lewis Bawden, S.-K Mo, Philip David King, H. Takagi, S. Limpijumnong, W. Meesvasana

Research output: Contribution to journal › Article › peer-review

Abstract

The electronic structure of a single Na monolayer on the surface of single-crystal HfSe₂ is investigate dusing angle-resolved photoemission spectroscopy. We find that this system exhibits analmost perfect “nearly-free-electron” behavior with an extracted effective mass of ∼1m_e, in contrast to heavier masses found previously for alkali metal monolayers on other substrates. Our density functional-theory calculations indicate that this is due to the large lattice constant, causing both exchange and correlation interactions to be suppressed, and to the weak hybridization between the overlayer and the substrate. This is therefore an ideal model system for understanding the properties of two-dimensional materials.

Original language	English
Article number	201121(R)
Number of pages	5
Journal	Physical Review. B, Condensed matter and materials physics
Volume	94
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.94.201121
Publication status	Published - 28 Nov 2016

Keywords

Monolayer Na
Weakly-interacting two-dimensional system
Transition metal dichalcogenide
HfSe2
Electronic structure
Angle-resolved photoemission spectroscopy

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10.1103/PhysRevB.94.201121

Na_band_161104p
© 2016, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at journals.aps.org /
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Cite this

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title = "Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2",

abstract = "The electronic structure of a single Na monolayer on the surface of single-crystal HfSe2 is investigate dusing angle-resolved photoemission spectroscopy. We find that this system exhibits analmost perfect “nearly-free-electron” behavior with an extracted effective mass of ∼1me, in contrast to heavier masses found previously for alkali metal monolayers on other substrates. Our density functional-theory calculations indicate that this is due to the large lattice constant, causing both exchange and correlation interactions to be suppressed, and to the weak hybridization between the overlayer and the substrate. This is therefore an ideal model system for understanding the properties of two-dimensional materials.",

keywords = "Monolayer Na, Weakly-interacting two-dimensional system, Transition metal dichalcogenide, HfSe2, Electronic structure, Angle-resolved photoemission spectroscopy",

author = "T. Eknapakul and I. Fongkaew and R. Vidyasagar and J.D. Denlinger and Lewis Bawden and S.-K Mo and King, {Philip David} and H. Takagi and S. Limpijumnong and W. Meesvasana",

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doi = "10.1103/PhysRevB.94.201121",

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T1 - Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

AU - Eknapakul, T.

AU - Fongkaew, I.

AU - Vidyasagar, R.

AU - Denlinger, J.D.

AU - Bawden, Lewis

AU - Mo, S.-K

AU - King, Philip David

AU - Takagi, H.

AU - Limpijumnong, S.

AU - Meesvasana, W.

PY - 2016/11/28

Y1 - 2016/11/28

N2 - The electronic structure of a single Na monolayer on the surface of single-crystal HfSe2 is investigate dusing angle-resolved photoemission spectroscopy. We find that this system exhibits analmost perfect “nearly-free-electron” behavior with an extracted effective mass of ∼1me, in contrast to heavier masses found previously for alkali metal monolayers on other substrates. Our density functional-theory calculations indicate that this is due to the large lattice constant, causing both exchange and correlation interactions to be suppressed, and to the weak hybridization between the overlayer and the substrate. This is therefore an ideal model system for understanding the properties of two-dimensional materials.

AB - The electronic structure of a single Na monolayer on the surface of single-crystal HfSe2 is investigate dusing angle-resolved photoemission spectroscopy. We find that this system exhibits analmost perfect “nearly-free-electron” behavior with an extracted effective mass of ∼1me, in contrast to heavier masses found previously for alkali metal monolayers on other substrates. Our density functional-theory calculations indicate that this is due to the large lattice constant, causing both exchange and correlation interactions to be suppressed, and to the weak hybridization between the overlayer and the substrate. This is therefore an ideal model system for understanding the properties of two-dimensional materials.

KW - Monolayer Na

KW - Weakly-interacting two-dimensional system

KW - Transition metal dichalcogenide

KW - HfSe2

KW - Electronic structure

KW - Angle-resolved photoemission spectroscopy

UR - http://journals.aps.org/prb/accepted/65078O35JfeEe31e72145215a03c61554232e022c

U2 - 10.1103/PhysRevB.94.201121

DO - 10.1103/PhysRevB.94.201121

M3 - Article

SN - 1098-0121

VL - 94

JO - Physical Review. B, Condensed matter and materials physics

JF - Physical Review. B, Condensed matter and materials physics

IS - 20

M1 - 201121(R)

ER -

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe₂

Abstract

Keywords

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Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

Cite this

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

Cite this

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe₂