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Trion valley coherence in monolayer semiconductors

Journal Article · · 2D Materials
 [1];  [2];  [2];  [3];  [2];  [2];  [3];  [3];  [2];  [4];  [2]
  1. Univ. of Texas, Austin, TX (United States); OSTI
  2. Univ. of Texas, Austin, TX (United States)
  3. Univ. of Regensburg (Germany)
  4. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating optical generation and manipulation of exciton valley coherence (the superposition of electron-hole pairs at opposite valleys) in monolayer transition metal dichalcogenides (TMDs) provide a critical step towards control of this quantum degree of freedom. The charged exciton (trion) in TMDs is an intriguing alternative to the neutral exciton for control of valley pseudospin because of its long spontaneous recombination lifetime, its robust valley polarization, and its coupling to residual electronic spin. Trion valley coherence has however been unexplored due to experimental challenges in accessing it spectroscopically. In this work, we employ ultrafast two-dimensional coherent spectroscopy to resonantly generate and detect trion valley coherence in monolayer MoSe2 demonstrating that it persists for a few-hundred femtoseconds. We conclude that the underlying mechanisms limiting trion valley coherence are fundamentally different from those applicable to exciton valley coherence.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of Texas, Austin, TX (United States). Energy Frontier Research Center (EFRC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012670
OSTI ID:
1463270
Alternate ID(s):
OSTI ID: 22800922
Journal Information:
2D Materials, Journal Name: 2D Materials Journal Issue: 2 Vol. 4; ISSN 2053-1583
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Dark-exciton valley dynamics in transition metal dichalcogenide alloy monolayers journal March 2019
Photon-Induced Spintronic Polaron Channel Modulator of CeO 2- x NP Thin Films Hydrogen Evolution Cells journal November 2018
Many-body simulation of two-dimensional electronic spectroscopy of excitons and trions in monolayer transition metal dichalcogenides journal July 2019
Ultrafast dynamics in van der Waals heterostructures journal November 2018
Interlayer charge transport controlled by exciton–trion coherent coupling journal April 2019
Band structure of monolayer transition-metal dichalcogenides and topological properties of their nanoribbons: Next-nearest-neighbor hopping journal August 2018
Single-scan acquisition of multiple multidimensional spectra journal January 2019
Inter-layer charge transport controlled by exciton-trion coherent coupling text January 2019

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