演讲嘉宾-Stephan Roche

Stephan Roche
加泰罗尼亚纳米科学和纳米技术研究所
  Stephan Roche是 ICREA的研究员,他是加泰罗尼亚纳米科学与技术研究所(icn2)纳米理论和计量组组长。他是一位理论物理学家,主攻量子传输和纳米材料设备的计算以及模型的发展。
  他的专长包括:n阶量子输运的发展(Kubo和landauer-büttiker电导方面),他已经率先在以石墨烯为基础的化学无序材料和设备的介观输运方面展开研究。
  在工业研究的背景下,他在开发先进的模拟工具方面经验丰富,他与一些大型公司(如NEC,ST微电子,和三星)都有过合作。他石墨烯旗舰计划的组员,负责监督包括石墨烯自旋电子学在内的工作。
演讲题目:
主题会场石墨烯战略前沿
开始时间
结束时间
内容摘要

The physics of graphene can be strongly enriched and manipulated by harvesting the large amount of possibilities of proximity effects with magnetic insulators, strong SOC materials (TMDC, topological insulators, etc.). Simultaneously, the presence of extra degrees of freedom (sublattice pseudospin, valley isospin) points towards new directions for information processing [1,2], extending the playground to valleytronics, multifunctional electronic devices or novel quantum computing paradigms harnessing all these degrees of freedom in combination with electromagnetic fields or other external fields (strain, chemical functionalization) [3,4]. 
Here I will present some foundations of spin transport for Dirac fermions propagating in supported graphene devices or interfaced with strong SOC materials. The role of entanglement with “valley and sublattice pseudospins” in tailoring the spin dephasing and relaxation mechanisms will be explained as well as the impact of strong SOC proximity effects on spin lifetime anisotropy, weak antilocalization and Spin Hall effect [4-8]. I will also refute recent claims concerning the formation of the valley Hall effect in graphene/hBN heterostructures which relate measured giant non-local resistance with Berry curvature-induced bulk valley currents [9]. Such analysis is fundamentally flawed, whereas the understanding of non-local transport properties requires advanced and realistic quantum transport calculations (see recent advances published in [10]).

[1] S. Roche et al. 2D Materials 2, 030202 (2015).
[2] D.V. Tuan et al. Nature Physics 10, 857 (2014).
[3] D.V. Tuan & S. Roche, Phys. Rev. Lett. 116, 106601 (2016).
[4] A.W. Cummings, J. H. García, J. Fabian and S. Roche, Phys. Rev. Lett. 119, 206601 (2016).
[5] J.H. García, A.W. Cummings, S. Roche, Nano Lett. 17 (8), 5078–5083 (2017).
[6] K. Song, D. Soriano, A.W. Cummings, R. Robles, P. Ordejón & S. Roche, Nano lett. 18 (3), 2033 (2018).
[7] J.H. García,  M. Vila,  A.W. Cummings & S. Roche, Chem. Soc. Rev. 47, 3359-3379 (2018).
[8] D. Khokhriakov, A.W. Cummings, M. Vila, B. Karpiak, A. Dankert,
S. Roche & S.P. Dash, Science Advances (in press)
[9] A. Cresti et al. Riv. Nuovo Cimento 39, 587 (2018).
[10] J. M. Marmolejo-Tejada et al., arXiv:1706.09361; J. Phys. Materials (in press).

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