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Generation, transport and detection of valley-locked spin photocurrent in WSe-graphene-BiSe heterostructures

Quantum optoelectronic devices capable of isolating a target degree of freedom (DoF) from other DoFs have allowed for new applications in modern information technology. Many works on solid-state spintronics have focused on methods to disentangle the spin DoF from the charge DoF, yet many related iss... Full description

Journal Title: Nature nanotechnology October 2018, Vol.13(10), pp.910-914
Main Author: Cha, Soonyoung
Other Authors: Noh, Minji , Kim, Jehyun , Son, Jangyup , Bae, Hyemin , Lee, Doeon , Kim, Hoil , Lee, Jekwan , Shin, Ho-Seung , Sim, Sangwan , Yang, Seunghoon , Lee, Sooun , Shim, Wooyoung , Lee, Chul-Ho , Jo, Moon-Ho , Kim, Jun Sung , Kim, Dohun , Choi, Hyunyong
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1748-3395 ; PMID: 30038368 Version:1 ; DOI: 10.1038/s41565-018-0195-y
Link: http://pubmed.gov/30038368
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title: Generation, transport and detection of valley-locked spin photocurrent in WSe-graphene-BiSe heterostructures
format: Article
creator:
  • Cha, Soonyoung
  • Noh, Minji
  • Kim, Jehyun
  • Son, Jangyup
  • Bae, Hyemin
  • Lee, Doeon
  • Kim, Hoil
  • Lee, Jekwan
  • Shin, Ho-Seung
  • Sim, Sangwan
  • Yang, Seunghoon
  • Lee, Sooun
  • Shim, Wooyoung
  • Lee, Chul-Ho
  • Jo, Moon-Ho
  • Kim, Jun Sung
  • Kim, Dohun
  • Choi, Hyunyong
subjects:
  • Information Technology
  • Information Technology
  • Photoelectric Emission
  • Transition Metals
  • Graphene
  • Spintronics
  • Graphene
  • Degrees of Freedom
  • Optoelectronic Devices
  • Polarization (Spin Alignment)
  • Photoelectric Effect
  • Heterostructures
  • Valleys
ispartof: Nature nanotechnology, October 2018, Vol.13(10), pp.910-914
description: Quantum optoelectronic devices capable of isolating a target degree of freedom (DoF) from other DoFs have allowed for new applications in modern information technology. Many works on solid-state spintronics have focused on methods to disentangle the spin DoF from the charge DoF, yet many related issues remain unresolved. Although the recent advent of atomically thin transition metal dichalcogenides (TMDs) has enabled the use of valley pseudospin as an alternative DoF, it is nontrivial to separate the spin DoF from the valley DoF since the time-reversal valley DoF is intrinsically locked with the spin DoF. Here, we demonstrate lateral TMD-graphene-topological insulator hetero-devices with the possibility of such a DoF-selective measurement. We generate the valley-locked spin DoF via a circular photogalvanic effect in an electric-double-layer WSe transistor. The valley-locked spin photocarriers then diffuse in a submicrometre-long graphene layer, and the spin DoF is measured separately in the topological insulator via non-local electrical detection using the characteristic spin-momentum locking. Operating at room temperature, our integrated devices exhibit a non-local spin polarization degree of higher than 0.5, providing the potential for coupled opto-spin-valleytronic applications that independently exploit the valley and spin DoFs.
language: eng
source:
identifier: E-ISSN: 1748-3395 ; PMID: 30038368 Version:1 ; DOI: 10.1038/s41565-018-0195-y
fulltext: fulltext
issn:
  • 17483395
  • 1748-3395
url: Link


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titleGeneration, transport and detection of valley-locked spin photocurrent in WSe-graphene-BiSe heterostructures
creatorCha, Soonyoung ; Noh, Minji ; Kim, Jehyun ; Son, Jangyup ; Bae, Hyemin ; Lee, Doeon ; Kim, Hoil ; Lee, Jekwan ; Shin, Ho-Seung ; Sim, Sangwan ; Yang, Seunghoon ; Lee, Sooun ; Shim, Wooyoung ; Lee, Chul-Ho ; Jo, Moon-Ho ; Kim, Jun Sung ; Kim, Dohun ; Choi, Hyunyong
ispartofNature nanotechnology, October 2018, Vol.13(10), pp.910-914
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descriptionQuantum optoelectronic devices capable of isolating a target degree of freedom (DoF) from other DoFs have allowed for new applications in modern information technology. Many works on solid-state spintronics have focused on methods to disentangle the spin DoF from the charge DoF, yet many related issues remain unresolved. Although the recent advent of atomically thin transition metal dichalcogenides (TMDs) has enabled the use of valley pseudospin as an alternative DoF, it is nontrivial to separate the spin DoF from the valley DoF since the time-reversal valley DoF is intrinsically locked with the spin DoF. Here, we demonstrate lateral TMD-graphene-topological insulator hetero-devices with the possibility of such a DoF-selective measurement. We generate the valley-locked spin DoF via a circular photogalvanic effect in an electric-double-layer WSe transistor. The valley-locked spin photocarriers then diffuse in a submicrometre-long graphene layer, and the spin DoF is measured separately in the topological insulator via non-local electrical detection using the characteristic spin-momentum locking. Operating at room temperature, our integrated devices exhibit a non-local spin polarization degree of higher than 0.5, providing the potential for coupled opto-spin-valleytronic applications that independently exploit the valley and spin DoFs.
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subjectInformation Technology ; Information Technology ; Photoelectric Emission ; Transition Metals ; Graphene ; Spintronics ; Graphene ; Degrees of Freedom ; Optoelectronic Devices ; Polarization (Spin Alignment) ; Photoelectric Effect ; Heterostructures ; Valleys;
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titleGeneration, transport and detection of valley-locked spin photocurrent in WSe-graphene-BiSe heterostructures
descriptionQuantum optoelectronic devices capable of isolating a target degree of freedom (DoF) from other DoFs have allowed for new applications in modern information technology. Many works on solid-state spintronics have focused on methods to disentangle the spin DoF from the charge DoF, yet many related issues remain unresolved. Although the recent advent of atomically thin transition metal dichalcogenides (TMDs) has enabled the use of valley pseudospin as an alternative DoF, it is nontrivial to separate the spin DoF from the valley DoF since the time-reversal valley DoF is intrinsically locked with the spin DoF. Here, we demonstrate lateral TMD-graphene-topological insulator hetero-devices with the possibility of such a DoF-selective measurement. We generate the valley-locked spin DoF via a circular photogalvanic effect in an electric-double-layer WSe transistor. The valley-locked spin photocarriers then diffuse in a submicrometre-long graphene layer, and the spin DoF is measured separately in the topological insulator via non-local electrical detection using the characteristic spin-momentum locking. Operating at room temperature, our integrated devices exhibit a non-local spin polarization degree of higher than 0.5, providing the potential for coupled opto-spin-valleytronic applications that independently exploit the valley and spin DoFs.
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titleGeneration, transport and detection of valley-locked spin photocurrent in WSe-graphene-BiSe heterostructures
authorCha, Soonyoung ; Noh, Minji ; Kim, Jehyun ; Son, Jangyup ; Bae, Hyemin ; Lee, Doeon ; Kim, Hoil ; Lee, Jekwan ; Shin, Ho-Seung ; Sim, Sangwan ; Yang, Seunghoon ; Lee, Sooun ; Shim, Wooyoung ; Lee, Chul-Ho ; Jo, Moon-Ho ; Kim, Jun Sung ; Kim, Dohun ; Choi, Hyunyong
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abstractQuantum optoelectronic devices capable of isolating a target degree of freedom (DoF) from other DoFs have allowed for new applications in modern information technology. Many works on solid-state spintronics have focused on methods to disentangle the spin DoF from the charge DoF, yet many related issues remain unresolved. Although the recent advent of atomically thin transition metal dichalcogenides (TMDs) has enabled the use of valley pseudospin as an alternative DoF, it is nontrivial to separate the spin DoF from the valley DoF since the time-reversal valley DoF is intrinsically locked with the spin DoF. Here, we demonstrate lateral TMD-graphene-topological insulator hetero-devices with the possibility of such a DoF-selective measurement. We generate the valley-locked spin DoF via a circular photogalvanic effect in an electric-double-layer WSe transistor. The valley-locked spin photocarriers then diffuse in a submicrometre-long graphene layer, and the spin DoF is measured separately in the topological insulator via non-local electrical detection using the characteristic spin-momentum locking. Operating at room temperature, our integrated devices exhibit a non-local spin polarization degree of higher than 0.5, providing the potential for coupled opto-spin-valleytronic applications that independently exploit the valley and spin DoFs.
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