Electronic structure and enhanced charge-density wave order of monolayer VSe2
How the interacting electronic states and phases of layered transition-metal dichalcogenides evolve when thinned to the single-layer limit is a key open question in the study of two-dimensional materials. Here, we use angle-resolved photoemission to investigate the electronic structure of monolayer...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
American Chemical Society
2018
|
| _version_ | 1797083864076648448 |
|---|---|
| author | Feng, J Biswas, D Rajan, A Watson, MD Mazzola, F Clark, OJ Underwood, K Marckovic, I McLaren, M Hunter, A Burn, DM Duffy, LB Barua, S Balakrishnan, G Bertran, F LeFevre, P Kim, T van der Laan, G Hesjedal, T Wahl, P King, PDC |
| author_facet | Feng, J Biswas, D Rajan, A Watson, MD Mazzola, F Clark, OJ Underwood, K Marckovic, I McLaren, M Hunter, A Burn, DM Duffy, LB Barua, S Balakrishnan, G Bertran, F LeFevre, P Kim, T van der Laan, G Hesjedal, T Wahl, P King, PDC |
| author_sort | Feng, J |
| collection | OXFORD |
| description | How the interacting electronic states and phases of layered transition-metal dichalcogenides evolve when thinned to the single-layer limit is a key open question in the study of two-dimensional materials. Here, we use angle-resolved photoemission to investigate the electronic structure of monolayer VSe2 grown on bilayer graphene/SiC. While the global electronic structure is similar to that of bulk VSe2, we show that, for the monolayer, pronounced energy gaps develop over the entire Fermi surface with decreasing temperature below Tc = 140 ± 5 K, concomitant with the emergence of charge-order superstructures evident in low-energy electron diffraction. These observations point to a charge-density wave instability in the monolayer that is strongly enhanced over that of the bulk. Moreover, our measurements of both the electronic structure and of X-ray magnetic circular dichroism reveal no signatures of a ferromagnetic ordering, in contrast to the results of a recent experimental study as well as expectations from density functional theory. Our study thus points to a delicate balance that can be realized between competing interacting states and phases in monolayer transition-metal dichalcogenides. |
| first_indexed | 2024-03-07T01:47:30Z |
| format | Journal article |
| id | oxford-uuid:98eef7e7-893f-4ea8-a0ab-aa2a37eb5370 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:47:30Z |
| publishDate | 2018 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:98eef7e7-893f-4ea8-a0ab-aa2a37eb53702022-03-27T00:10:36ZElectronic structure and enhanced charge-density wave order of monolayer VSe2Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:98eef7e7-893f-4ea8-a0ab-aa2a37eb5370Symplectic Elements at OxfordAmerican Chemical Society2018Feng, JBiswas, DRajan, AWatson, MDMazzola, FClark, OJUnderwood, KMarckovic, IMcLaren, MHunter, ABurn, DMDuffy, LBBarua, SBalakrishnan, GBertran, FLeFevre, PKim, Tvan der Laan, GHesjedal, TWahl, PKing, PDCHow the interacting electronic states and phases of layered transition-metal dichalcogenides evolve when thinned to the single-layer limit is a key open question in the study of two-dimensional materials. Here, we use angle-resolved photoemission to investigate the electronic structure of monolayer VSe2 grown on bilayer graphene/SiC. While the global electronic structure is similar to that of bulk VSe2, we show that, for the monolayer, pronounced energy gaps develop over the entire Fermi surface with decreasing temperature below Tc = 140 ± 5 K, concomitant with the emergence of charge-order superstructures evident in low-energy electron diffraction. These observations point to a charge-density wave instability in the monolayer that is strongly enhanced over that of the bulk. Moreover, our measurements of both the electronic structure and of X-ray magnetic circular dichroism reveal no signatures of a ferromagnetic ordering, in contrast to the results of a recent experimental study as well as expectations from density functional theory. Our study thus points to a delicate balance that can be realized between competing interacting states and phases in monolayer transition-metal dichalcogenides. |
| spellingShingle | Feng, J Biswas, D Rajan, A Watson, MD Mazzola, F Clark, OJ Underwood, K Marckovic, I McLaren, M Hunter, A Burn, DM Duffy, LB Barua, S Balakrishnan, G Bertran, F LeFevre, P Kim, T van der Laan, G Hesjedal, T Wahl, P King, PDC Electronic structure and enhanced charge-density wave order of monolayer VSe2 |
| title | Electronic structure and enhanced charge-density wave order of monolayer VSe2 |
| title_full | Electronic structure and enhanced charge-density wave order of monolayer VSe2 |
| title_fullStr | Electronic structure and enhanced charge-density wave order of monolayer VSe2 |
| title_full_unstemmed | Electronic structure and enhanced charge-density wave order of monolayer VSe2 |
| title_short | Electronic structure and enhanced charge-density wave order of monolayer VSe2 |
| title_sort | electronic structure and enhanced charge density wave order of monolayer vse2 |
| work_keys_str_mv | AT fengj electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT biswasd electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT rajana electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT watsonmd electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT mazzolaf electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT clarkoj electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT underwoodk electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT marckovici electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT mclarenm electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT huntera electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT burndm electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT duffylb electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT baruas electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT balakrishnang electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT bertranf electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT lefevrep electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT kimt electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT vanderlaang electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT hesjedalt electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT wahlp electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 AT kingpdc electronicstructureandenhancedchargedensitywaveorderofmonolayervse2 |