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Title: Ultrafast dynamics in van der Waals heterostructures

Abstract

Van der Waals heterostructures are synthetic quantum materials composed of stacks of atomically thin two-dimensional (2D) layers. Because the electrons in the atomically thin 2D layers are exposed to layer-to-layer coupling, the properties of van der Waals heterostructures are defined not only by the constituent monolayers, but also by the interactions between the layers. Many fascinating electrical, optical and magnetic properties have recently been reported in different types of van der Waals heterostructures. In this Review, we focus on unique excited-state dynamics in transition metal dichalcogenide (TMDC) heterostructures. TMDC monolayers are the most widely studied 2D semiconductors, featuring prominent exciton states and accessibility to the valley degree of freedom. Many TMDC heterostructures are characterized by a staggered band alignment. This band alignment has profound effects on the evolution of the excited states in heterostructures, including ultrafast charge transfer between the layers, the formation of interlayer excitons, and the existence of long-lived spin and valley polarization in resident carriers. Furthermore we review recent experimental and theoretical efforts to elucidate electron dynamics in TMDC heterostructures, extending from timescales of femtoseconds to microseconds, and comment on the relevance of these effects for potential applications in optoelectronic, valleytronic and spintronic devices.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [4];  [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Stanford Univ., Stanford, CA (United States)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1490655
Alternate Identifier(s):
OSTI ID: 1616967
Grant/Contract Number:  
AC02-76SF00515; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Nanotechnology
Additional Journal Information:
Journal Volume: 13; Journal Issue: 11; Journal ID: ISSN 1748-3387
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Jin, Chenhao, Ma, Eric Yue, Karni, Ouri, Regan, Emma C., Wang, Feng, and Heinz, Tony F. Ultrafast dynamics in van der Waals heterostructures. United States: N. p., 2018. Web. doi:10.1038/s41565-018-0298-5.
Jin, Chenhao, Ma, Eric Yue, Karni, Ouri, Regan, Emma C., Wang, Feng, & Heinz, Tony F. Ultrafast dynamics in van der Waals heterostructures. United States. doi:10.1038/s41565-018-0298-5.
Jin, Chenhao, Ma, Eric Yue, Karni, Ouri, Regan, Emma C., Wang, Feng, and Heinz, Tony F. Mon . "Ultrafast dynamics in van der Waals heterostructures". United States. doi:10.1038/s41565-018-0298-5. https://www.osti.gov/servlets/purl/1490655.
@article{osti_1490655,
title = {Ultrafast dynamics in van der Waals heterostructures},
author = {Jin, Chenhao and Ma, Eric Yue and Karni, Ouri and Regan, Emma C. and Wang, Feng and Heinz, Tony F.},
abstractNote = {Van der Waals heterostructures are synthetic quantum materials composed of stacks of atomically thin two-dimensional (2D) layers. Because the electrons in the atomically thin 2D layers are exposed to layer-to-layer coupling, the properties of van der Waals heterostructures are defined not only by the constituent monolayers, but also by the interactions between the layers. Many fascinating electrical, optical and magnetic properties have recently been reported in different types of van der Waals heterostructures. In this Review, we focus on unique excited-state dynamics in transition metal dichalcogenide (TMDC) heterostructures. TMDC monolayers are the most widely studied 2D semiconductors, featuring prominent exciton states and accessibility to the valley degree of freedom. Many TMDC heterostructures are characterized by a staggered band alignment. This band alignment has profound effects on the evolution of the excited states in heterostructures, including ultrafast charge transfer between the layers, the formation of interlayer excitons, and the existence of long-lived spin and valley polarization in resident carriers. Furthermore we review recent experimental and theoretical efforts to elucidate electron dynamics in TMDC heterostructures, extending from timescales of femtoseconds to microseconds, and comment on the relevance of these effects for potential applications in optoelectronic, valleytronic and spintronic devices.},
doi = {10.1038/s41565-018-0298-5},
journal = {Nature Nanotechnology},
issn = {1748-3387},
number = 11,
volume = 13,
place = {United States},
year = {2018},
month = {11}
}

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    Works referencing / citing this record:

    Valleytronics in transition metal dichalcogenides materials
    journal, August 2019