title: Magnetic effects in sulfur-decorated graphene.
abstract: The interaction between two different materials can present novel phenomena that are quite different from the physical properties observed when each material stands alone. Strong electronic correlations, such as magnetism and superconductivity, can be produced as the result of enhanced Coulomb interactions between electrons. Two-dimensional materials are powerful candidates to search for the novel phenomena because of the easiness of arranging them and modifying their properties accordingly. In this work, we report magnetic effects in graphene, a prototypical non-magnetic two-dimensional semi-metal, in the proximity with sulfur, a diamagnetic insulator. In contrast to the well-defined metallic behaviour of clean graphene, an energy gap develops at the Fermi energy for the graphene/sulfur compound with decreasing temperature. This is accompanied by a steep increase of the resistance, a sign change of the slope in the magneto-resistance between high and low fields, and magnetic hysteresis. A possible origin of the observed electronic and magnetic responses is discussed in terms of the onset of low-temperature magnetic ordering. These results provide intriguing insights on the search for novel quantum phases in graphene-based compounds.
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Physics, Pusan National University, Busan 46241, Republic of Korea.
authors.forename: Choongyu
authors.initials: C
authors.lastname: Hwang
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Physics, University of California, Berkeley, CA 94720, USA.
authors.forename: Shane A
authors.initials: SA
authors.lastname: Cybart
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Shin
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.|c_CCMR, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
authors.forename: Sooran
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.|MPPC_CPM, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
authors.forename: Kyoo
authors.initials: K
authors.lastname: Kim
authors.affiliation: Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 219410972 Rio de Janeiro RJ, Brazil.
authors.forename: T G
authors.initials: TG
authors.lastname: Rappoport
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Physics, University of California, Berkeley, CA 94720, USA.
authors.forename: S M
authors.initials: SM
authors.lastname: Wu
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: C
authors.initials: C
authors.lastname: Jozwiak
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: A V
authors.initials: AV
authors.lastname: Fedorov
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: S-K
authors.initials: SK
authors.lastname: Mo
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Physics, University of California, Berkeley, CA 94720, USA.
authors.forename: D-H
authors.initials: DH
authors.lastname: Lee
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
authors.forename: B I
authors.initials: BI
authors.lastname: Min
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.
authors.forename: E E
authors.initials: EE
authors.lastname: Haller
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Physics, University of California, Berkeley, CA 94720, USA.|Department of Physics, University of California, San Diego, CA 92093, USA.
authors.forename: R C
authors.initials: RC
authors.lastname: Dynes
authors.affiliation: Centre for Advanced 2D Materials, National University of Singapore, Singapore 117542.
authors.forename: A H
authors.initials: AH
authors.lastname: Castro Neto
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Physics, University of California, Berkeley, CA 94720, USA.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Lanzara