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Title: Giant spin-splitting and gap renormalization driven by trions in single-layer WS2/h-BN heterostructures

Journal Article · · Nature Physics
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4];  [1];  [1]; ORCiD logo [4]; ORCiD logo [1];  [3]; ORCiD logo [3]; ORCiD logo [3]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Aarhus Univ., Aarhus C (Denmark)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Naval Research Lab., Washington, D.C. (United States)

In two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs), new electronic phenomena such as tunable bandgaps and strongly bound excitons and trions emerge from strong many-body effects, beyond the spin and valley degrees of freedom induced by spin-orbit coupling and by lattice symmetry. Combining single-layer TMDs with other 2D materials in van der Waals heterostructures offers an intriguing means of controlling the electronic properties through these many-body effects, by means of engineered interlayer interactions. Here, we use micro-focused angle-resolved photoemission spectroscopy (microARPES) and in situ surface doping to manipulate the electronic structure of single-layer WS2 on hexagonal boron nitride (WS2/h-BN). Upon electron doping, we observe an unexpected giant renormalization of the spin-orbit splitting of the single-layer WS2 valence band, from 430 meV to 660 meV, together with a bandgap reduction of at least 325 meV, attributed to the formation of trionic quasiparticles. Furthermore, these findings suggest that the electronic, spintronic and excitonic properties are widely tunable in 2D TMD/h-BN heterostructures, as these are intimately linked to the quasiparticle dynamics of the materials.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1462967
Journal Information:
Nature Physics, Vol. 14, Issue 4; Related Information: © 2017 The Author(s).; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 68 works
Citation information provided by
Web of Science

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Cited By (24)

Uncovering the Conduction Behavior of van der Waals Ambipolar Semiconductors journal October 2018
Recent Advances in van der Waals Heterojunctions Based on Semiconducting Transition Metal Dichalcogenides journal August 2018
Nanoscale mapping of quasiparticle band alignment journal July 2019
Dielectric disorder in two-dimensional materials journal August 2019
Visualizing electrostatic gating effects in two-dimensional heterostructures journal July 2019
Demonstration of the key substrate-dependent charge transfer mechanisms between monolayer MoS2 and molecular dopants journal September 2019
Angle-resolved photoemission spectroscopy and its application to topological materials journal August 2019
BX 1 –BX 2 (X 1 , X 2 = P, As, Sb) lateral heterostructure: novel and efficient two-dimensional photovoltaic materials with ultra-high carrier mobilities journal January 2019
Imaging microscopic electronic contrasts at the interface of single-layer WS 2 with oxide and boron nitride substrates journal April 2019
Electronegativity, phase transition, and ferroelectricity of TeSe 2 few-layers journal October 2019
Multimodal spectromicroscopy of monolayer WS 2 enabled by ultra-clean van der Waals epitaxy journal July 2018
Production and processing of graphene and related materials journal January 2020
Electronic band structure of Two-Dimensional WS 2 /Graphene van der Waals Heterostructures journal April 2018
Nanospot angle-resolved photoemission study of Bernal-stacked bilayer graphene on hexagonal boron nitride: Band structure and local variation of lattice alignment journal April 2019
Direct Determination of Band-Gap Renormalization in the Photoexcited Monolayer MoS 2 journal June 2019
Rigid Band Shifts in Two-Dimensional Semiconductors through External Dielectric Screening journal November 2019
Enhanced Electron-Phonon Interaction in Multivalley Materials journal August 2019
Giant gate-tunable bandgap renormalization and excitonic effects in a 2D semiconductor journal July 2019
A Perspective on the Application of Spatially Resolved ARPES for 2D Materials journal April 2018
Production and processing of graphene and related materials text January 2020
Production and processing of graphene and related materials text January 2020
Imaging microscopic electronic contrasts at the interface of single-layer WS$_2$ with oxide and boron nitride substrates text January 2019
Nanospot Angle-Resolved Photoemission Study of Bernal-Stacked Bilayer Graphene on Hexagonal Boron Nitride: Band Structure and Local Variation of Lattice Alignment text January 2019
Angle-resolved photoemission spectroscopy and its application to topological materials text January 2021

Figures / Tables (4)


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