Microsecond dark-exciton valley polarization memory in 2D heterostructures
arXiv:1703.03133 · doi:10.1038/s41467-018-03174-3
Abstract
Transition metal dichalcogenides (TMDs) have valley degree of freedom, which features optical selection rule and spin-valley locking, making them promising for valleytronics devices and quantum computation. For either application, a long valley polarization lifetime is crucial. Previous results showed that it is around picosecond in monolayer excitons, nanosecond for electrons, holes or local excitons and tens of nanosecond for interlayer excitons. Here we show that dark excitons in 2D heterostructures provide a microsecond valley polarization memory thanks to the magnetic field induced suppression of valley mixing. The lifetime of the dark excitons shows magnetic field and temperature dependence which is consistent with the theoretical prediction. The long dark exciton lifetime and valley polarization lifetime in 2D heterostructures make them promising for long-distance exciton transport and macroscopic quantum state generations.
References in corpus (15)
- Valley polarization in MoS2 monolayers by optical pumping
- The Valley Hall Effect in MoS2 Transistors
- Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
- Strong interlayer coupling in van der Waals heterostructures built from single-layer chalcogenides
- Magnetic Control of Valley Pseudospin in Monolayer WSe2
- Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
- Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices
- High-temperature superfluidity with indirect excitons in van der Waals heterostructures
- Magnetic brightening and control of dark excitons in monolayer WSe2
- Robust optical emission polarization in MoS2 monolayers through selective valley excitation
- Long-lived direct and indirect interlayer excitons in van der Waals heterostructures
- Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
- Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
- Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure
- Unconventional Quantum Hall Effect and Tunable Spin Hall Effect in MoS2 Trilayers
Cited by in corpus (36)
- Signatures of moiré-trapped valley excitons in MoSe/WSe heterobilayers
- Long-lived direct and indirect interlayer excitons in van der Waals heterostructures
- Microsecond Valley Lifetime of Defect-Bound Excitons in Monolayer WSe
- Spin-layer locking of interlayer excitons trapped in moiré potentials
- Exciton g-factors of van der Waals heterostructures from first principles calculations
- Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure
- Moiré excitons in MoSe-WSe heterobilayers and heterotrilayers
- Cavity-control of bright and dark interlayer excitons in van der Waals heterostructures
- Localized bright luminescence of indirect excitons and trions in MoSe/WSe van der Waals heterostructure
- Exciton optics, dynamics and transport in atomically thin semiconductors
- Opportunities in Electrically Tunable 2D Materials Beyond Graphene: Recent Progress and Future Outlook
- Optical control of a single spin-valley in charged WSe quantum dots
- Layer engineered interlayer excitons
- Optical control of valley Zeeman effect through many-exciton interactions
- Emergence of highly linearly polarized interlayer exciton emission in MoSe/WSe heterobilayers with transfer-induced layer corrugation
- Room-temperature bipolar valleytronic transistor in MoS2/WSe2 heterostructures
- Valley Degree of Freedom in Two-Dimensional van der Waals Materials
- Twist angle dependent interlayer transfer of valley polarization from excitons to free charge carriers in WSe/MoSe heterobilayers
- Leaky exciton condensates in transition metal dichalcogenide moiré bilayers
- Up- and Down-Conversion between Intra- and Inter-Valley Excitons in Waveguide Coupled Monolayer WSe2
- Tunable magneto-optical properties in MoS via defect-induced exciton transitions
- Controlling valley splitting and Polarization of dark- and bi-excitons in monolayer WS by a tilted magnetic field
- Impact of indirect transitions on valley polarization in WS and WSe
- Circular photogalvanic effect in 2D van der Waals heterostructure
- Spin-valley dynamics in alloy-based transition metal dichalcogenide heterobilayers
- Twisting enabled charge transfer excitons in epitaxially fused quantum dot molecules
- Two dimensional semiconductors: optical and electronic properties
- Dynamic Valley Polarization in Moire Quantum Dots
- Spin/Valley pumping of resident electrons in WSe2 and WS2 monolayers
- Spatial filtering of interlayer exciton ground state in WSe2/MoS2 heterobilayer
- Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion
- Element-specific ultrafast lattice dynamics in monolayer WSe2
- Exciton fractional Chern insulators in moiré heterostructures
- Limits of funneling efficiency in non-uniformly strained 2D semiconductors
- Room temperature interlayer exciton valley polarization and valley Hall effect
- Magnetically-Sensitive Valley Polarization Reversal and Revival of Defect-Localized Excitons in WSe2-WS2