Long-range transport of 2D excitons with acoustic waves

• URL: http://arxiv.org/abs/2108.01773v2
• Date: Tue, 22 Feb 2022 06:16:23 GMT
• Title: Long-range transport of 2D excitons with acoustic waves
• Authors: Ruoming Peng, Adina Ripin, Yusen Ye, Jiayi Zhu, Changming Wu, Seokhyeong Lee, Huan Li, Takashi Taniguchi, Kenji Watanabe, Ting Cao, Xiaodong Xu, Mo Li
• Abstract summary: interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices. We demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by surface acoustic waves (SAW) Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices.
• Score: 6.229575126259341
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to their long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by the propagating potential traps induced by surface acoustic waves (SAW). We show that at 100 K, the SAW-driven excitonic transport is activated above a threshold acoustic power and reaches 20 mm, a distance at least ten times longer than the diffusion length and only limited by the device size. Temperature-dependent measurement reveals the transition from the diffusion-limited regime at low temperature to the acoustic field-driven regime at elevated temperature. Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices such as exciton transistors, switches, and transducers up to room temperature.

Related papers

• Ab-Initio Calculations of Nonlinear Susceptibility and Multi-Phonon Mixing Processes in a 2DEG-Piezoelectric Heterostructure [41.94295877935867]
  Solid-state elastic-wave phonons are a promising platform for a wide range of quantum information applications. We propose a general architecture using piezoelectric-semiconductor heterostructures. We show that, for this system, the strong third-order nonlinearity could enable single-phonon Kerr shift in an acoustic cavity.
  arXiv  Detail & Related papers  (2024-02-01T03:34:41Z)
• Probing and control of guided exciton-polaritons in a 2D semiconductor-integrated slab waveguide [0.0]
  We show a powerful approach for probing and manipulating guided polaritons in a Ta2O5 slab integrated with a WS2 monolayer. We also demonstrate the transition from weak to strong coupling accompanied by the onset of the motional narrowing effect. Our results enable the development of integrated optics employing room-temperature exciton-polaritons in 2D semiconductor-based structures.
  arXiv  Detail & Related papers  (2023-05-22T09:32:03Z)
• A highly-sensitive broadband superconducting thermoelectric single-photon detector [62.997667081978825]
  A thermoelectric detector (TED) converts a finite temperature difference caused by the absorption of a single photon into an open circuit thermovoltage. Our TED is able to reveal single-photons of frequency ranging from about 15 GHz to about 150 PHz depending on the chosen design and materials.
  arXiv  Detail & Related papers  (2023-02-06T17:08:36Z)
• Superfluid drag between excitonic polaritons and superconducting electron gas [0.0]
  The Andreev-Bashkin effect, or superfluid drag, is predicted in a system of Bose-condensed excitonic polaritons in optical microcavity. The predicted nondissipative drag could be strong enough to be observable as induction of a supercurrent in the electronic layer by a flow of polariton Bose condensate.
  arXiv  Detail & Related papers  (2022-04-22T15:04:46Z)
• Interlayer Exciton Diode and Transistor [0.31458406135473804]
  We report unidirectional transport of IXs along nanoscale electrostatically defined channels in an MoSe$$-WSe$$ heterostructure. These results are enabled by a lithographically defined triangular etch in a graphene gate to create a potential energy ''slide'' Our work paves the way towards low loss excitonic circuits, the study of bosonic transport in one-dimensional channels, and custom potential energy landscapes for excitons in van der Waals heterostructures.
  arXiv  Detail & Related papers  (2022-03-17T17:04:23Z)
• Indirect exciton-phonon dynamics in MoS2 revealed by ultrafast electron diffraction [5.782172606425799]
  Transition metal dichalcogenides layered nano-crystals are emerging as promising candidates for next-generation optoelectronic and quantum devices. Here, we use ultrafast electron diffraction and ab initio calculations to investigate the many-body structural dynamics following nearly-resonant excitation of low-energy indirect excitons in MoS2. Our results highlight the strong selectivity of phononic excitations directly associated with the specific indirect-exciton nature of the wavelength-dependent electronic transitions triggered in the system.
  arXiv  Detail & Related papers  (2021-12-30T23:23:08Z)
• Engineering the Radiative Dynamics of Thermalized Excitons with Metal Interfaces [58.720142291102135]
  We analyze the emission properties of excitons in TMDCs near planar metal interfaces. We find suppression or enhancement of emission relative to the point dipole case by several orders of magnitude. nanoscale optical cavities are a viable pathway to generating long-lifetime exciton states in TMDCs.
  arXiv  Detail & Related papers  (2021-10-11T19:40:24Z)
• Depinning of the Charge-Density Waves in Quasi-2D 1T-TaS2 Devices Operating at Room Temperature [0.0]
  We report on depinning of nearly-commensurate charge-density waves in 1T-TaS2 thin-films at room temperature. The depinning process in 1T-TaS2 is not accompanied by an observable abrupt increase in electric current.
  arXiv  Detail & Related papers  (2021-04-29T00:17:19Z)
• Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
  tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits. We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
  arXiv  Detail & Related papers  (2020-11-29T09:57:50Z)
• Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
  We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
  arXiv  Detail & Related papers  (2020-06-05T09:27:53Z)
• Condensation signatures of photogenerated interlayer excitons in a van der Waals heterostack [46.1292414445895]
  Atomistic van der Waals heterostacks are ideal systems for high-temperature exciton condensation. Our study provides a first phase-diagram of many-body interlayer exciton states including Bose Einstein condensation.
  arXiv  Detail & Related papers  (2020-01-21T14:29:43Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.