Spin symmetry breaking in bilayer quantum Hall systems
نویسندگان
چکیده
منابع مشابه
Broken-symmetry states in doubly gated suspended bilayer graphene.
The single-particle energy spectra of graphene and its bilayer counterpart exhibit multiple degeneracies that arise through inherent symmetries. Interactions among charge carriers should spontaneously break these symmetries and lead to ordered states that exhibit energy gaps. In the quantum Hall regime, these states are predicted to be ferromagnetic in nature, whereby the system becomes spin po...
متن کاملEvidence for a spin phase transition at charge neutrality in bilayer graphene
The quantum spin Hall effect is characterized by spin-polarized counter-propagating edge states1–3. It has been predicted that this edge state configuration could occur in graphene when spin-split electronand hole-like Landau levels are forced to cross at the edge of the sample4–6. In particular, a quantumspin-Hall analogue has been predicted in bilayer graphene with a Landau level filling fact...
متن کاملBilayer graphene. Tunable fractional quantum Hall phases in bilayer graphene.
Symmetry-breaking in a quantum system often leads to complex emergent behavior. In bilayer graphene (BLG), an electric field applied perpendicular to the basal plane breaks the inversion symmetry of the lattice, opening a band gap at the charge neutrality point. In a quantizing magnetic field, electron interactions can cause spontaneous symmetry-breaking within the spin and valley degrees of fr...
متن کاملThermal Transport Signatures of Broken-Symmetry Phases in Graphene.
In the half filled zero-energy Landau level of bilayer graphene, competing phases with spontaneously broken symmetries and an intriguing quantum critical behavior have been predicted. Here we investigate signatures of these broken-symmetry phases in thermal transport measurements. To this end, we calculate the spectrum of spin and valley waves in the ν=0 quantum Hall state of bilayer graphene. ...
متن کاملSymmetry-breaking skyrmion states in fractional quantum Hall systems
We calculate in an analyical fashion the energies and net spins of skyrmions in fractional quantum Hall systems, based on the suggestion that skyrmion states are spontaneously LZ and SZ symmetry-breaking states. The quasiholeskyrmion state with a charge −e/3 around ν = 1/3, where the ground state is known as a spin-polarized ferromagnetic state, is found to exist even in high magnetic fields up...
متن کامل