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Moiré Assisted Fractional Quantum Hall State Spectroscopy
Fengcheng Wu, A. H. MacDonald
Intra-Landau level excitations in the fractional quantum Hall regime are not accessible via optical absorption measurements. We point out that optical probes are enabled by the per…
Modulation of mechanical resonance by chemical potential oscillation in graphene
Changyao Chen, Vikram V. Deshpande, Mikito Koshino +5
The classical picture of the force on a capacitor assumes a large density of electronic states, such that the electrochemical potential of charges added to the capacitor is given b…
Inter-band Coherence Response to Electric Fields in Crystals
Dimitrie Culcer, Akihiko Sekine, Allan H. MacDonald
In solid state conductors, linear response to a steady electric field is normally dominated by Bloch state occupation number changes that are correlated with group velocity and lea…
Theory of the Spin Seebeck Effect at a Topological-Insulator/Ferromagnetic-Insulator Interface
Nobuyuki Okuma, Massoud Ramezani Masir, Allan H. MacDonald
The spin-Seebeck effect refers to voltage signals induced in metals by thermally driven spin currents in adjacent magnetic systems. We present a theory of the spin-Seebeck signal i…
Spatially-indirect Exciton Condensate Phases in Double Bilayer Graphene
Jung-Jung Su, Allan H. MacDonald
We present a theory of spatially indirect exciton condensate states in systems composed of a pair of electrically isolated Bernal graphene bilayers. The ground state phase diagram…
Trion Valley Coherence in Monolayer Semiconductors
Kai Hao, Lixiang Xu, Fengcheng Wu +8
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating…
Observation of a Nematic Quantum Hall Liquid on the Surface of Bismuth
Benjamin E. Feldman, Mallika T. Randeria, András Gyenis +5
Nematic quantum fluids with wavefunctions that break the underlying crystalline symmetry can form in interacting electronic systems. We examine the quantum Hall states that arise i…
Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
Dmitry K. Efimkin, Allan H. MacDonald
Recent optical studies of monolayer transition metal dechalcogenides have demonstrated that their excitonic absorption feature splits into two widely separated peaks at finite carr…
Orbital and spin order in oxide two-dimensional electron gases
John R. Tolsma, Marco Polini, Allan H. MacDonald
We describe a variational theory of multi-band two-dimensional electron gases that captures the interplay between electrostatic confining potentials, orbital-dependent interlayer e…
Interface-Induced Phenomena in Magnetism
Frances Hellman, Axel Hoffmann, Yaroslav Tserkovnyak +24
This article reviews static and dynamic interfacial effects in magnetism, focusing on interfacially-driven magnetic effects and phenomena associated with spin-orbit coupling and in…
Fractional Hofstadter States in Graphene on Hexagonal Boron Nitride
Ashley M. DaSilva, Jeil Jung, Allan H. MacDonald
In fractionally filled Landau levels there is only a small energy difference between broken translational symmetry electron-crystal states and exotic correlated quantum fluid state…
Spin-Superfluidity and Spin-Current Mediated Non-Local Transport
Hua Chen, Allan H. MacDonald
Some strategies for reducing energy consumption in information processing devices involve the use of spin rather than charge to carry information. This idea is especially attractiv…
Electronic and magnetic properties of single-layer MPX metal phosphorous trichalcogenides
Bheema Lingam Chittari, Youngju Park, Dongkyu Lee +4
We systematically investigate the electronic structure and magnetic properties of two dimensional (2D) MPX (M= V, Cr, Mn, Fe, Co, Ni, Cu, Zn, and X = S, Se, Te) transition meta…
Enhanced spin Seebeck effect signal due to spin-momentum locked topological surface states
Zilong Jiang, Cui-Zu Chang, Massoud Ramezani Masir +5
Spin-momentum locking in protected surface states enables efficient electrical detection of magnon decay at a magnetic-insulator/topological-insulator heterojunction. Here we demon…