Persistent Charge-Density-Wave Order in Single-Layer TaSe2

被引：110

作者：

Ryu, Hyejin ^{[1
,2
,14
,15
]}

Chen, Yi ^{[3
,14
,15
]}

Kim, Heejung ^{[4
]}

Tsai, Hsin-Zon ^{[3
]}

Tang, Shujie ^{[1
,5
]}

Jiang, Juan ^{[1
]}

Liou, Franklin ^{[3
]}

Kahn, Salman ^{[3
]}

Jia, Caihong ^{[3
,6
,7
]}

Omrani, Arash A. ^{[3
]}

Shim, Ji Hoon ^{[4
,8
,9
]}

Hussain, Zahid ^{[1
]}

Shen, Zhi-Xun ^{[5
,10
,11
]}

Kim, Kyoo ^{[2
,4
]}

Min, Byung Il ^{[4
]}

Hwang, Choongyu ^{[12
]}

Crommie, Michael F. ^{[3
,13
,14
,15
]}

Mo, Sung-Kwan ^{[1
]}

机构：

[1] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[2] Pohang Univ Sci & Technol, Max Planck POSTECH Ctr Complex Phase Mat, Pohang 37673, South Korea

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Pohang Univ Sci & Technol, Dept Phys, Pohang 37673, South Korea

[5] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[6] Henan Univ, Henan Key Lab Photovolta Mat, Kaifeng 475004, Peoples R China

[7] Henan Univ, Lab Low Dimens Mat Sci, Kaifeng 475004, Peoples R China

[8] Pohang Univ Sci & Technol, Dept Chem, Pohang 37673, South Korea

[9] Pohang Univ Sci & Technol, Div Adv Nucl Engn, Pohang 37673, South Korea

[10] Stanford Univ, Dept Phys, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[11] Stanford Univ, Dept Appl Phys, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[12] Pusan Natl Univ, Dept Phys, Busan 46241, South Korea

[13] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[14] Univ Calif Berkeley, Kavli Energy Nano Sci Inst, Berkeley, CA 94720 USA

[15] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2018年 / 18卷 / 02期

基金：

美国国家科学基金会;

关键词：

Transition metal dichalcogenides; 2D materials; TaSe2; charge density wave; CDW; MBE; ARPES; STM; TRANSITION; 2H-TASE2; NBSE2;

D O I：

10.1021/acs.nanolett.7b03264

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present the electronic characterization of single-layer 1H-TaSe2 grown by molecular beam epitaxy using a combined angle-resolved photoeinission spectroscopy, scanning tunneling microscopy/spectroscopy, and density functional theory calculations. We demonstrate that 3 x 3 charge-density-wave (CDW) order persists despite distinct changes in the low energy electronic. structure highlighted by the reduction in the number of-bands crossing the Fermi energy and the corresponding modification Of Fermi surface topology. Enhanced, spin-orbit coupling and lattice distortion in the single-layer play a crucial role in the formation of CDW order. Our findings provide a deeper understanding of the nature of COW order in the two-dimensional limit.

引用

页码：689 / 694

页数：6

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