Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session C35: Advances in Spin Transport and Proximity Near Nanoscale Interfaces and MaterialsInvited Live
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Sponsoring Units: GMAG Chair: Michael Flatté, Univ of Iowa |
Monday, March 15, 2021 3:00PM - 3:36PM Live |
C35.00001: Spin-orbit proximity effects in graphene-based heterostructures Invited Speaker: Felix Casanova The integration of the spin in charge-based electronic devices has revolutionized both sensing and memory capability in microelectronics. Further development in spintronic devices requires electrical manipulation of spin current as well as spin-charge interconversion for logic operations. Graphene has raised as an outstanding spin transporter due to its weak spin-orbit coupling (SOC). However, a strong SOC is required for an electrical control of the spin state, as in the seminal proposal of Datta and Das [1], or to achieve spin-charge interconversion, via the spin Hall effect. In this talk, I will show how SOC can be induced in graphene by proximity with another material, allowing us to manipulate spin currents. |
Monday, March 15, 2021 3:36PM - 4:12PM Live |
C35.00002: Spin-orbit proximity phenomena and tunable spin-to-charge interconversion in van der Waals heterostructures Invited Speaker: Sergio Valenzuela The isolation of a large variety of two-dimensional materials (2DM) and their co-integration in van der Waals heterostructures has opened new avenues for innovative material design and engineering. In particular, the structural interface quality in the atomically smooth 2DMs allows us to imprint properties of interest in a chosen 2DM by proximity-induced effects. Such an approach is particularly compelling for spintronic devices, which harness their functionality from thin layers of magnetic and non-magnetic materials and their interfaces. In this talk, I will present recent experiments in which we investigate the spin dynamics in graphene-transition metal dichalcogenides heterostructures. I will show that the spin-orbit coupling in graphene can be strongly enhanced by proximity effects. As a consequence, the spin relaxation becomes highly anisotropic, with spin lifetimes that are markedly different depending on the spin orientation [1,2]. I will further demonstrate that the proximity-induced spin-orbit coupling leads to strongly enhanced spin-to-charge interconversion [3]. By performing spin precession experiments in appropriately designed Hall bars, we are able to separate the contributions of the spin Hall and the spin galvanic effects. Remarkably, their corresponding conversion efficiencies can be tailored by electrostatic gating in magnitude and sign, peaking near the graphene charge neutrality point and having a large magnitude even at room temperature. |
Monday, March 15, 2021 4:12PM - 4:48PM Live |
C35.00003: Theory of oblique-field magnetoresistance from spin centers in three-terminal spintronic devices Invited Speaker: Nicholas Harmon Spin and charge transport across magnetic/non-magnetic interfaces have sparked interest over the past several years. So-called three terminal measurements have been interpreted in two primary ways: either as a Hanle effect associated with spin transport into a non-magnetic material or as a magnetoresistance induced by spin-dependent transport through a defect situated at the interface [1-3]. |
Monday, March 15, 2021 4:48PM - 5:24PM Live |
C35.00004: Spin caloritronics and magnon transport in (anti) ferromagnetic Van der Waals heterostructures Invited Speaker: Bart Van Wees Spin caloritronics [1] studies an utilizes the coupling between charge, spin and heat transport in a variety of material classes. In recent years it has become clear that magnons (elementary spin wave excitations of the magnetic order) can be excellent long range carriers of spin information in insulating (anti) ferromagnetic materials, thus allowing the transport of spin information, in the absence of charge transport. I will describe how magnons can be generated thermally, by means of the spin Seebeck effect, but also by electrical means, using the spin Hall effect for conversion of charge currents into magnon spin currents (and vice versa). I will then discuss recent experiments [2] [3] [4] where we investigated non-local magnon transport and spin related thermo electric effects such as anomalous Nernst effect to measure non local magnon transport in ferromagnetic (CrBr3 [2], CrGeTe3 [2], CrSiTe3 [3]) and antiferromagnetic (MnPS3 and related compounds [4]) layered Van der Waals materials. I will conclude by describing the challenges to push the research towards the ultimate 2D magnon regime. |
Monday, March 15, 2021 5:24PM - 6:00PM Live |
C35.00005: Harnessing chirality in hybrid semiconductors Invited Speaker: Joseph J Berry Hybrid organic/inorganic semiconductors (HOIS) offer tremendous opportunities to control fundamental properties that underpin energy technologies. While currently there are enormous worldwide efforts exploring, exploiting and improving a narrow class of HOIS (lead-halide perovskites, such as methylammonium lead iodide), primarily for photovoltaic (PV) applications, there are opportunities to transcend this initial focus on PV research and seek deeper understanding and control of their fundamental properties. Inherent in these unique hybrid systems is the dichotomy between organic/molecular moieties (quantum chemistry) and inorganic/extended systems (solid state physics). As a result, they exhibit properties that are not solely a juxtaposition of the inorganic and organic sub-units, but are instead truly emergent phenomena, with the concomitant ability to control and design new properties by judicious choice of inorganic and organic components. This presentation will focus on efforts to control and manipulate the spin degree of freedom in these HOIS systems. The presentation will focus on collaborative work in the Center for Hybrid Organic Inorganic Semiconductors for Energy center in examining chiral induced spin selectivity (CISS) in hybrid semiconductor systems. Specifically, recent basic material observations in chiral hybrid systems will be discussed along with demonstrations of harnessing CISS as a functional material property and a new class of spintronic materials. |
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