Excitonic and deep-level emission from N- and Al-polar homoepitaxial AlN grown by molecular beam epitaxy

Kavli Affiliate: Grace Xing | First 5 Authors: Len van Deurzen, Jashan Singhal, Jimy Encomendero, Naomi Pieczulewski, Celesta Chang | Summary: Using low-temperature cathodoluminescence spectroscopy, we study the properties of N- and Al-polar AlN layers grown by molecular beam epitaxy on bulk AlN{0001}. Compared to the bulk AlN substrate, layers of both polarities feature a […]


Continue.. Excitonic and deep-level emission from N- and Al-polar homoepitaxial AlN grown by molecular beam epitaxy

Supercurrent mediated by helical edge modes in bilayer graphene

Kavli Affiliate: Srijit Goswami | First 5 Authors: Prasanna Rout, Nikos Papadopoulos, Fernando Peñaranda, Kenji Watanabe, Takashi Taniguchi | Summary: Bilayer graphene encapsulated in tungsten diselenide can host a weak topological phase with pairs of helical edge states. The electrical tunability of this phase makes it an ideal platform to investigate unique topological effects at […]


Continue.. Supercurrent mediated by helical edge modes in bilayer graphene

Supercurrent mediated by helical edge modes in bilayer graphene

Kavli Affiliate: Srijit Goswami | First 5 Authors: Prasanna Rout, Nikos Papadopoulos, Fernando Peñaranda, Kenji Watanabe, Takashi Taniguchi | Summary: Bilayer graphene encapsulated in tungsten diselenide can host a weak topological phase with pairs of helical edge states. The electrical tunability of this phase makes it an ideal platform to investigate unique topological effects at […]


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Improved Bounds for Single-Nomination Impartial Selection

Kavli Affiliate: Felix Fischer | First 5 Authors: Javier Cembrano, Felix Fischer, Max Klimm, , | Summary: We give new bounds for the single-nomination model of impartial selection, a problem proposed by Holzman and Moulin (Econometrica, 2013). A selection mechanism, which may be randomized, selects one individual from a group of $n$ based on nominations […]


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Improved Bounds for Single-Nomination Impartial Selection

Kavli Affiliate: Felix Fischer | First 5 Authors: Javier Cembrano, Felix Fischer, Max Klimm, , | Summary: We give new bounds for the single-nomination model of impartial selection, a problem proposed by Holzman and Moulin (Econometrica, 2013). A selection mechanism, which may be randomized, selects one individual from a group of $n$ based on nominations […]


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Unconfounded Propensity Estimation for Unbiased Ranking

Kavli Affiliate: Dan Luo | First 5 Authors: Dan Luo, Lixin Zou, Qingyao Ai, Zhiyu Chen, Chenliang Li | Summary: The goal of unbiased learning to rank (ULTR) is to leverage implicit user feedback for optimizing learning-to-rank systems. Among existing solutions, automatic ULTR algorithms that jointly learn user bias models (i.e., propensity models) with unbiased […]


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Asymmetric node placement in fiber-based quantum networks

Kavli Affiliate: Stephanie Wehner | First 5 Authors: Guus Avis, Robert Knegjens, Anders S. Sørensen, Stephanie Wehner, | Summary: Restrictions imposed by existing infrastructure can make it hard to ensure an even spacing between the nodes of future fiber-based quantum networks. We here investigate the negative effects of asymmetric node placement by considering separately the […]


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Asymmetric node placement in fiber-based quantum networks

Kavli Affiliate: Stephanie Wehner | First 5 Authors: Guus Avis, Robert Knegjens, Anders S. Sørensen, Stephanie Wehner, | Summary: Restrictions imposed by existing infrastructure can make it hard to ensure an even spacing between the nodes of future fiber-based quantum networks. We here investigate the negative effects of asymmetric node placement by considering separately the […]


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Breakdown of helical edge state topologically protected conductance in time-reversal-breaking excitonic insulators

Kavli Affiliate: Joel E. Moore | First 5 Authors: Yan-Qi Wang, Michał Papaj, Joel E. Moore, , | Summary: Gapless helical edge modes are a hallmark of the quantum spin Hall effect. Protected by time-reversal symmetry, each edge contributes a quantized zero-temperature conductance quantum $G_0 equiv e^2/h$. However, the experimentally observed conductance in WTe$_2$ decreases […]


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Power Grid Transient Analysis via Open-Source Circuit Simulator: A Case Study of HVDC

Kavli Affiliate: Xiang Zhang | First 5 Authors: Yongli Zhu, Xiang Zhang, Renchang Dai | Summary: This paper proposes an electronic circuit simulator-based method to accelerate the power system transient simulation, where the modeling of a generic HVDC (High Voltage Direct Current) system is focused. The electronic circuit simulation equations and the backward differentiation formula […]


Continue.. Power Grid Transient Analysis via Open-Source Circuit Simulator: A Case Study of HVDC