Publications (19)
Detecting Gamma-Ray Anisotropies from Decaying Dark Matter: Prospects for Fermi LAT
Alejandro Ibarra, David Tran, Christoph Weniger
Decaying dark matter particles could be indirectly detected as an excess over a simple power law in the energy spectrum of the diffuse extragalactic gamma-ray background. Furthermo…
Decaying Dark Matter and the PAMELA Anomaly
Alejandro Ibarra, David Tran
Astrophysical and cosmological observations do not require the dark matter particles to be absolutely stable. If they are indeed unstable, their decay into positrons might occur at…
Gamma-Ray Lines from Radiative Dark Matter Decay
Mathias Garny, Alejandro Ibarra, David Tran +1
The decay of dark matter particles which are coupled predominantly to charged leptons has been proposed as a possible origin of excess high-energy positrons and electrons observed…
Gate Tunable Magnetism and Giant Magnetoresistance in ABC-stacked Few-Layer Graphene
Yongjin Lee, Shi Che, Jairo Velasco +6
Magnetism is a prototypical phenomenon of quantum collective state, and has found ubiquitous applications in semiconductor technologies such as dynamic random access memory (DRAM).…
Broken Symmetry Quantum Hall States in Dual Gated ABA Trilayer Graphene
Yongjin Lee, Jairo Velasco, David Tran +6
We present low temperature transport measurements on dual-gated suspended trilayer graphene in the quantum Hall (QH) regime. We observe QH plateaus at filling factors ν=-8, -2, 2,…
Distinct Competing Ordered ν=2 States in Bilayer Graphene
J. Velasco, Y. Lee, Fan Zhang +6
Because of its large density-of-states and the 2Ï Berry phase near its low-energy band-contact points, neutral bilayer graphene (BLG) at zero magnetic field (B) is susceptible to…